Gnomes
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Gnomes are an underground-dwelling race of creatures, related to the
Dwarves, but even more closely in touch with the earth.
They are quite small, and share many characteristics with Halflings
(except for the great agility), although they advance slightly more
slowly in experience levels. They are okay at most skills, but
excellent at earth elemental magic and very poor at air magic.

Occasionally, they can use their empathy with the earth to sense their
surroundings; this ability increases in power as they gain experience 
levels.

    case ABIL_MAPPING:          // Gnome + sense surrounds mut

    case ABIL_MAPPING:          // Sense surroundings mutation

                || you.level_type == LEVEL_LABYRINTH))

                || !player_in_mappable_area()))

        return false;

        return (false);