Thanks!
Here are the pertinent bits:
On the round following detection, an obliviax can steal the memories of an intelligent creature within 60 feet. It can attempt this theft only once per round. The affected creature must succeed on a DC 14 Will save or lose all recollection of the last 24 hours. If the target is a spellcaster who prepares spells, all prepared spells are lost until the target rests to prepare them again. If the target is a spellcaster who does not prepare spells, the target loses all remaining spells per day until he rests again. An affected creature takes 1d3 points of Wisdom damage, becoming baffled and disoriented, with all memory of the previous 24 hours completely blanked out. Surrounding the moss with lead will block this power totally. This is a mind-affecting compulsion effect. This effect cannot negate charm, geas/quest, suggestion, or similar spells. Obliviaxes prefer the memories of arcane spellcasters who prepare spells above all others.
Stolen Spells (Su): An obliviax mossling can cast some of the spells stolen by its parent patch of obliviax when it was created. Although all the spells are stolen, an oblviax mossling can only cast spells of a level equal to or lower than its Hit Dice. The caster level for a stolen spell is the minimum caster level needed to cast the spell, regardless of the original caster's level. The save DCs are Charisma-based. The mossling casts its stolen spells as if they were spell-like abilities, although once it casts a spell, it cannot reuse that spell. If the obliviax stole the memories of a spellcaster who does not prepare spells, then the remaining spells per day are determined randomly from the caster's list of spells known.