static bool _tso_blessing_holy_arm(monsters* mon)
{
    if (mons_res_negative_energy(mon) == 3)
        return false;
    // Pick either a monster's armour or its shield.
    const int armour = mon->inv[MSLOT_ARMOUR];
    const int shield = mon->inv[MSLOT_SHIELD];

    if (armour == NON_ITEM && shield == NON_ITEM)
        return false;
    int slot;
    do
    {
        slot = (coinflip()) ? armour : shield;
    }
    while (slot == NON_ITEM);
    item_def& arm(mitm[slot]);
    if (is_artefact(arm) || get_armour_ego_type(arm) == SPARM_POSITIVE_ENERGY)
        return false;
    // And make it resistant to negative energy.
    set_equip_desc(arm, ISFLAG_GLOWING);
    set_item_ego_type(arm, OBJ_ARMOUR, SPARM_POSITIVE_ENERGY);
    arm.colour = YELLOW;
    return true;
}

}
static bool _beogh_blessing_elec_wpn(monsters *mon)
{
    // Pick a monster's weapon.
    const int weapon = mon->inv[MSLOT_WEAPON];
    if (weapon == NON_ITEM)
        return false;
    item_def& wpn(mitm[weapon]);
    if (is_artefact(wpn) || get_weapon_brand(wpn) == SPWPN_ELECTROCUTION)
        return false;
    // And make it electric.
    set_equip_desc(wpn, ISFLAG_GLOWING);
    set_item_ego_type(wpn, OBJ_WEAPONS, SPWPN_ELECTROCUTION);
    wpn.colour = YELLOW;
    return true;

                // Brand a monster's armour with positive energy, if
                // possible.
                if (_tso_blessing_holy_arm(mon))
                {
                    result = "life defence";
                    goto blessing_done;
                }

                // Brand a monster's weapon with electrocution, if
                // possible.
                if (_beogh_blessing_elec_wpn(mon))
                {
                    result = "electric attack power";
                    goto blessing_done;
                }