Teamfight Tactics explores magic, portals, and bees with Set 12, Magic n’ Mayhem—and with it comes a new layer of strategic depth in the Charms mechanic.

These new purchasable spells, appearing in every other shop slot, offer a vast array of effects from economic boons to battlefield disruption—and they’re set to sprinkle a bit of magic in all TFT games starting from Wednesday, July 31. But in over a hundred Charms in Magic n’ Mayhem, one reigns supreme: The Magnum Opus. Literally translating to “Great Work,” the Magnum Opus is Set 12’s most powerful Charm, according to the Riot Games developers, but it comes with a hefty price both of gold and blood.