Could use scrolls, charged wands, vials, books, totems, whatever. And none of this "it costs 1000 platinum per scroll" foolishness. No, you let players craft them in stacks, sell them from the NPC vendors in big stacks so people can put those big stacks on their hotbar and want to use it as a huge gold sink! If it's inexpensive and effective, players will use it.
Magical item use; It works for Faerūn/Toril, it can work for Amalur!