The arcanist can learn to cast a spell by suffering from its effects. When the arcanist fails a saving throw against a spell cast by an enemy, as an immediate action she can expend 1 point from her arcane reservoir to temporarily acquire the spell. She can cast the spell using her spell slots as if it was a spell she had prepared that day. The spell must be on the sorcerer/wizard spell list and must be of a level that she can cast. The ability to cast this spell remains for a number of rounds equal to the arcanist's Charisma modifier (minimum 1).
