SPELL_VISION

Usage       : cast vision
Accumulative: No
Duration    : level
Level       : Unknown
Mana Usage  : Unknown

This spell greatly heightens the caster's sight. It will allow him or
her to see invisible things as well as sense living creatures nearby
which may be hidden or otherwise obscured. This spell also imbues the
caster with the power to detect magical auras on items and to see all
alignment auras.