This spell takes a spell that is currently memorized (up to 4th level), and transfers it to the 'location' of Isaac's Mnemonic Transferral. The transferred spell remains in its original place also. The caster could, for example, use Isaac's Mnemonic Transferral on a memorized Fireball spell. The caster then has two memorized Fireball spells.
The casting time for the Mnemonic Transferral is the level of the spell being transferred, in segments.
The components of this spell are a quill from a gryphon, inscribed with special runes, and a green emerald worth at least 200 gp.