Boneraiser kinda did that already. But reverse a vampire surivor. You are the enemies. You create hordes of monsters (amount of kinda, maybe even some individual changes you can make per monstertype or just frankenstein them together). You can change their strategy in attacking and formation. And most importantly you the money you gather you can use to support and upgrade the heroes making them stronger and dropping more experience as a result. Oh, and then simply make it an MMORPG, thankies.
Boneraiser kinda did that already. But reverse a vampire surivor. You are the enemies. You create hordes of monsters (amount of kinda, maybe even some individual changes you can make per monstertype or just frankenstein them together). You can change their strategy in attacking and formation. And most importantly you the money you gather you can use to support and upgrade the heroes making them stronger and dropping more experience as a result. Oh, and then simply make it an MMORPG, thankies.