Ashes of Memories Lost

This extremely fine powder is derived from the charred coals of desiccated wormwood root. The ash is pure white in appearance and feels virtually weightless. Dispersing a single handful of this substance into the air creates a nearly transparent cloud with a 10-foot radius. In any round a spellcaster enters or is within the cloud, he must make a DC 17 save vs. Wisdom. Failure means that the ability to cast a random spell prepared by the spellcaster (or random unused spell slot if the subject casts spells spontaneously) is lost for the next 24 hours. The cloud remains active for 10 minutes. A moderate wind disperses the cloud in one round. The ashes do not function in rain. The ashes affect creatures with spell-like abilities as if they have spells. Failure of a DC 17 save vs. Wisdom consumes the use of a random spell-like ability for a 24-hour period. The ashes do not affect magic items unless the item is an intelligent magic item. Treat intelligent magic items in the same way as creatures with spell-like abilities or as NPC spell casters, which ever is more appropriate.