invisibility

Usage:          cast 'invisibility' [char in room, object in inventory, object in room, npc, pc]
Duration:       12 + level/4 hours, permanent on objects 
Waitstates:     2: MAG, SOR, LOR, SAG, NIN, SWO, WIZ, MON 
Accumulative:   Duration
Violence:       Positive
Costs:          50 - 15 
Position:       Standing
AMS-State:      inside AMS
Classes:        (L7)  MAG, SOR, LOR, SAG, NIN, SWO, WIZ, MON
Magic Sources:  n/a
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Self explanatory.
Attacking while invisible will immediately break the spell.