// There's nothing you can do with an empty box if you can't unwield it.
    if (!equipped && item.sub_type == MISC_EMPTY_EBONY_CASKET)
        return (false);

            case OBJ_MISCELLANY:

                break;
            case OBJ_MISCELLANY:
                if (item.sub_type >= MISC_DECK_OF_ESCAPE
                    && item.sub_type <= MISC_DECK_OF_DEFENCE)
                {
                    tip += "Wield (w)";
                    break;
                }
                tip += "Evoke (V)";

            // Unwield staves or weapons.
            if (check_warning_inscriptions(item, OPER_WIELD))

            // Unwield wielded items.
            if (equipped && check_warning_inscriptions(item, OPER_WIELD))

static bool _ball_of_energy();
static bool _ball_of_fixation();
static bool _ball_of_seeing();
static bool _box_of_beasts();
static bool _disc_of_storms();
static bool _efreet_flask();

static bool _efreet_flask()

static bool _efreet_flask(int slot)

    dec_inv_item_quantity(you.equip[EQ_WEAPON], 1);

    dec_inv_item_quantity(slot, 1);

bool evoke_item(int slot)
{
    if (you.duration[DUR_BERSERKER])
    {
        canned_msg( MSG_TOO_BERSERK );
        return (false);
    }
    if (player_in_bat_form())
    {
        canned_msg(MSG_PRESENT_FORM);
        return (false);
    }
    if (slot == -1)
    {
        slot = prompt_invent_item( "Evoke which item? (* to show all)",
                                   MT_INVLIST,
                                   OSEL_EVOKABLE, true, true, true, 0, -1,
                                   NULL, OPER_EVOKE );
        if (prompt_failed(slot))
            return (false);
    }
    ASSERT (slot >= 0);
    const bool wielded = (you.equip[EQ_WEAPON] == slot);
    item_def& item = you.inv[slot];
    // Also handles messages.
    if (!item_is_evokable(item, false, true))
        return (false);
    // Check inscriptions.
    if (!check_warning_inscriptions(item, OPER_EVOKE))
        return (false);
    int power = 0;
    int pract = 0; // By how much Evocations is practised.
    bool did_work = false;  // Used for default "nothing happens" message.
    bool unevokable = false;
    switch (item.base_type)
    {
    case OBJ_WANDS:
        zap_wand(slot);
        return (true);
    case OBJ_WEAPONS:
        ASSERT(wielded);
        if (get_weapon_brand(item) == SPWPN_REACHING)
        {
            if (_reaching_weapon_attack(item))
            {
                pract = 0;
                did_work = true;
            }
            else
                return (false);
        }
        else if (is_fixed_artefact(item))
        {
            switch (item.special)
            {
            case SPWPN_STAFF_OF_DISPATER:
                if (you.duration[DUR_DEATHS_DOOR] || !enough_hp(11, true)
                    || !enough_mp(5, true))
                {
                    break;
                }
                mpr("You feel the staff feeding on your energy!");
                dec_hp( 5 + random2avg(19, 2), false, "Staff of Dispater" );
                dec_mp( 2 + random2avg(5, 2) );
                make_hungry(100, false, true);
                power = you.skills[SK_EVOCATIONS] * 8;
                your_spells( SPELL_HELLFIRE, power, false );
                pract = (coinflip() ? 2 : 1);
                did_work = true;
                break;
            case SPWPN_SCEPTRE_OF_ASMODEUS:
                if (evoke_sceptre_of_asmodeus())
                {
                    make_hungry(200, false, true);
                    did_work = true;
                    pract = 1;
                }
                break;
            case SPWPN_STAFF_OF_OLGREB:
                if (!enough_mp( 4, true )
                    || you.skills[SK_EVOCATIONS] < random2(6))
                {
                    break;
                }
                dec_mp(4);
                make_hungry(50, false, true);
                pract = 1;
                did_work = true;
                power = 10 + you.skills[SK_EVOCATIONS] * 8;
                your_spells( SPELL_OLGREBS_TOXIC_RADIANCE, power, false );
                if (x_chance_in_y(you.skills[SK_EVOCATIONS] + 1, 10))
                    your_spells( SPELL_VENOM_BOLT, power, false );
                break;
            case SPWPN_STAFF_OF_WUCAD_MU:
                if (you.magic_points == you.max_magic_points
                    || you.skills[SK_EVOCATIONS] < random2(25))
                {
                    break;
                }
                mpr("Magical energy flows into your mind!");
                inc_mp( 3 + random2(5) + you.skills[SK_EVOCATIONS] / 3, false );
                make_hungry(50, false, true);
                pract = 1;
                did_work = true;
                if (one_chance_in(3))
                {
                    // NH_NEVER prevents "nothing happens" messages.
                    MiscastEffect( &you, NON_MONSTER, SPTYP_DIVINATION,
                                   random2(9), random2(70),
                                   "the Staff of Wucad Mu", NH_NEVER );
                }
                break;
            default:
                unevokable = true;
                break;
            }
        }
        else
            unevokable = true;
        break;
    case OBJ_STAVES:
        ASSERT(wielded);
        if (item_is_rod( item ))
        {
            pract = staff_spell( slot );
            // [ds] Early exit, no turns are lost.
            if (pract == -1)
                return (false);
            did_work = true;  // staff_spell() will handle messages
        }
        else if (item.sub_type == STAFF_CHANNELING)
        {
            if (you.magic_points < you.max_magic_points
                && x_chance_in_y(you.skills[SK_EVOCATIONS] + 11, 40))
            {
                mpr("You channel some magical energy.");
                inc_mp( 1 + random2(3), false );
                make_hungry(50, false, true);
                pract = 1;
                did_work = true;
                if (!item_type_known(item))
                {
                    set_ident_type( OBJ_STAVES, item.sub_type, ID_KNOWN_TYPE );
                    set_ident_flags( item, ISFLAG_KNOW_TYPE );
                    mprf("You are wielding %s.",
                         item.name(DESC_NOCAP_A).c_str());
                    more();
                    you.wield_change = true;
                }
            }
        }
        else
        {
            unevokable = true;
        }
        break;
    case OBJ_MISCELLANY:
        did_work = true; // easier to do it this way for misc items
        if (is_deck(item))
        {
            ASSERT(wielded);
            evoke_deck(item);
            pract = 1;
            break;
        }
        switch (item.sub_type)
        {
        case MISC_BOTTLED_EFREET:
            if (_efreet_flask())
                pract = 2;
            break;
        case MISC_CRYSTAL_BALL_OF_SEEING:
            if (_ball_of_seeing())
                pract = 1;
            break;
        case MISC_AIR_ELEMENTAL_FAN:
            if (you.skills[SK_EVOCATIONS] <= random2(30))
                canned_msg(MSG_NOTHING_HAPPENS);
            else
            {
                cast_summon_elemental(100, GOD_NO_GOD, MONS_AIR_ELEMENTAL, 4);
                pract = (one_chance_in(5) ? 1 : 0);
            }
            break;
        case MISC_LAMP_OF_FIRE:
            if (you.skills[SK_EVOCATIONS] <= random2(30))
                canned_msg(MSG_NOTHING_HAPPENS);
            else
            {
                cast_summon_elemental(100, GOD_NO_GOD, MONS_FIRE_ELEMENTAL, 4);
                pract = (one_chance_in(5) ? 1 : 0);
            }
            break;
        case MISC_STONE_OF_EARTH_ELEMENTALS:
            if (you.skills[SK_EVOCATIONS] <= random2(30))
                canned_msg(MSG_NOTHING_HAPPENS);
            else
            {
                cast_summon_elemental(100, GOD_NO_GOD, MONS_EARTH_ELEMENTAL, 4);
                pract = (one_chance_in(5) ? 1 : 0);
            }
            break;

        case MISC_HORN_OF_GERYON:
            if (evoke_horn_of_geryon())
                pract = 1;
            break;
        case MISC_BOX_OF_BEASTS:
            if (_box_of_beasts())
                pract = 1;
            break;
        case MISC_CRYSTAL_BALL_OF_ENERGY:
            if (_ball_of_energy())
                pract = 1;
            break;
        case MISC_CRYSTAL_BALL_OF_FIXATION:
            if (_ball_of_fixation())
                pract = 1;
            break;
        case MISC_DISC_OF_STORMS:
            if (_disc_of_storms())
                pract = (coinflip() ? 2 : 1);
            break;
        default:
            did_work = false;
            unevokable = true;
            break;
        }
        break;
    default:
        unevokable = true;
        break;
    }
    if (!did_work)
        canned_msg(MSG_NOTHING_HAPPENS);
    else if (pract > 0)
        exercise( SK_EVOCATIONS, pract );
    if (!unevokable)
        you.turn_is_over = true;
    else
        crawl_state.zero_turns_taken();
    return (did_work);
}

static bool _box_of_beasts()

static bool _box_of_beasts(item_def &box)

            you.weapon()->sub_type = MISC_EMPTY_EBONY_CASKET;

            box.sub_type = MISC_EMPTY_EBONY_CASKET;

    you.duration[DUR_SLOW] = duration;

    you.duration[DUR_SLOW]      = duration;

bool evoke_item(int slot)
{
    if (you.duration[DUR_BERSERKER])
    {
        canned_msg( MSG_TOO_BERSERK );
        return (false);
    }
    if (player_in_bat_form())
    {
        canned_msg(MSG_PRESENT_FORM);
        return (false);
    }
    if (slot == -1)
    {
        slot = prompt_invent_item( "Evoke which item? (* to show all)",
                                   MT_INVLIST,
                                   OSEL_EVOKABLE, true, true, true, 0, -1,
                                   NULL, OPER_EVOKE );
        if (prompt_failed(slot))
            return (false);
    }
    ASSERT (slot >= 0);
    const bool wielded = (you.equip[EQ_WEAPON] == slot);
    item_def& item = you.inv[slot];
    // Also handles messages.
    if (!item_is_evokable(item, false, true))
        return (false);
    // Check inscriptions.
    if (!check_warning_inscriptions(item, OPER_EVOKE))
        return (false);
    int power = 0;
    int pract = 0; // By how much Evocations is practised.
    bool did_work = false;  // Used for default "nothing happens" message.
    bool unevokable = false;
    switch (item.base_type)
    {
    case OBJ_WANDS:
        zap_wand(slot);
        return (true);
    case OBJ_WEAPONS:
        ASSERT(wielded);
        if (get_weapon_brand(item) == SPWPN_REACHING)
        {
            if (_reaching_weapon_attack(item))
            {
                pract = 0;
                did_work = true;
            }
            else
                return (false);
        }
        else if (is_fixed_artefact(item))
        {
            switch (item.special)
            {
            case SPWPN_STAFF_OF_DISPATER:
                if (you.duration[DUR_DEATHS_DOOR] || !enough_hp(11, true)
                    || !enough_mp(5, true))
                {
                    break;
                }
                mpr("You feel the staff feeding on your energy!");
                dec_hp( 5 + random2avg(19, 2), false, "Staff of Dispater" );
                dec_mp( 2 + random2avg(5, 2) );
                make_hungry(100, false, true);
                power = you.skills[SK_EVOCATIONS] * 8;
                your_spells( SPELL_HELLFIRE, power, false );
                pract = (coinflip() ? 2 : 1);
                did_work = true;
                break;
            case SPWPN_SCEPTRE_OF_ASMODEUS:
                if (evoke_sceptre_of_asmodeus())
                {
                    make_hungry(200, false, true);
                    did_work = true;
                    pract = 1;
                }
                break;
            case SPWPN_STAFF_OF_OLGREB:
                if (!enough_mp( 4, true )
                    || you.skills[SK_EVOCATIONS] < random2(6))
                {
                    break;
                }
                dec_mp(4);
                make_hungry(50, false, true);
                pract = 1;
                did_work = true;
                power = 10 + you.skills[SK_EVOCATIONS] * 8;
                your_spells( SPELL_OLGREBS_TOXIC_RADIANCE, power, false );
                if (x_chance_in_y(you.skills[SK_EVOCATIONS] + 1, 10))
                    your_spells( SPELL_VENOM_BOLT, power, false );
                break;
            case SPWPN_STAFF_OF_WUCAD_MU:
                if (you.magic_points == you.max_magic_points
                    || you.skills[SK_EVOCATIONS] < random2(25))
                {
                    break;
                }
                mpr("Magical energy flows into your mind!");
                inc_mp( 3 + random2(5) + you.skills[SK_EVOCATIONS] / 3, false );
                make_hungry(50, false, true);
                pract = 1;
                did_work = true;
                if (one_chance_in(3))
                {
                    // NH_NEVER prevents "nothing happens" messages.
                    MiscastEffect( &you, NON_MONSTER, SPTYP_DIVINATION,
                                   random2(9), random2(70),
                                   "the Staff of Wucad Mu", NH_NEVER );
                }
                break;
            default:
                unevokable = true;
                break;
            }
        }
        else
            unevokable = true;
        break;
    case OBJ_STAVES:
        ASSERT(wielded);
        if (item_is_rod( item ))
        {
            pract = staff_spell( slot );
            // [ds] Early exit, no turns are lost.
            if (pract == -1)
                return (false);
            did_work = true;  // staff_spell() will handle messages
        }
        else if (item.sub_type == STAFF_CHANNELING)
        {
            if (you.magic_points < you.max_magic_points
                && x_chance_in_y(you.skills[SK_EVOCATIONS] + 11, 40))
            {
                mpr("You channel some magical energy.");
                inc_mp( 1 + random2(3), false );
                make_hungry(50, false, true);
                pract = 1;
                did_work = true;
                if (!item_type_known(item))
                {
                    set_ident_type( OBJ_STAVES, item.sub_type, ID_KNOWN_TYPE );
                    set_ident_flags( item, ISFLAG_KNOW_TYPE );
                    mprf("You are wielding %s.",
                         item.name(DESC_NOCAP_A).c_str());
                    more();
                    you.wield_change = true;
                }
            }
        }
        else
        {
            unevokable = true;
        }
        break;
    case OBJ_MISCELLANY:
        did_work = true; // easier to do it this way for misc items
        if (is_deck(item))
        {
            ASSERT(wielded);
            evoke_deck(item);
            pract = 1;
            break;
        }
        switch (item.sub_type)
        {
        case MISC_BOTTLED_EFREET:
            if (_efreet_flask(slot))
                pract = 2;
            break;
        case MISC_CRYSTAL_BALL_OF_SEEING:
            if (_ball_of_seeing())
                pract = 1;
            break;
        case MISC_AIR_ELEMENTAL_FAN:
            if (you.skills[SK_EVOCATIONS] <= random2(30))
                canned_msg(MSG_NOTHING_HAPPENS);
            else
            {
                cast_summon_elemental(100, GOD_NO_GOD, MONS_AIR_ELEMENTAL, 4);
                pract = (one_chance_in(5) ? 1 : 0);
            }
            break;
        case MISC_LAMP_OF_FIRE:
            if (you.skills[SK_EVOCATIONS] <= random2(30))
                canned_msg(MSG_NOTHING_HAPPENS);
            else
            {
                cast_summon_elemental(100, GOD_NO_GOD, MONS_FIRE_ELEMENTAL, 4);
                pract = (one_chance_in(5) ? 1 : 0);
            }
            break;
        case MISC_STONE_OF_EARTH_ELEMENTALS:
            if (you.skills[SK_EVOCATIONS] <= random2(30))
                canned_msg(MSG_NOTHING_HAPPENS);
            else
            {
                cast_summon_elemental(100, GOD_NO_GOD, MONS_EARTH_ELEMENTAL, 4);
                pract = (one_chance_in(5) ? 1 : 0);
            }
            break;
        case MISC_HORN_OF_GERYON:
            if (evoke_horn_of_geryon())
                pract = 1;
            break;
        case MISC_BOX_OF_BEASTS:
            if (_box_of_beasts(item))
                pract = 1;
            break;
        case MISC_CRYSTAL_BALL_OF_ENERGY:
            if (_ball_of_energy())
                pract = 1;
            break;
        case MISC_CRYSTAL_BALL_OF_FIXATION:
            if (_ball_of_fixation())
                pract = 1;
            break;
        case MISC_DISC_OF_STORMS:
            if (_disc_of_storms())
                pract = (coinflip() ? 2 : 1);
            break;
        default:
            did_work = false;
            unevokable = true;
            break;
        }
        break;
    default:
        unevokable = true;
        break;
    }
    if (!did_work)
        canned_msg(MSG_NOTHING_HAPPENS);
    else if (pract > 0)
        exercise( SK_EVOCATIONS, pract );
    if (!unevokable)
        you.turn_is_over = true;
    else
        crawl_state.zero_turns_taken();
    return (did_work);
}