Do you accept ideas for games? if so here's an idea: The idea is to make a terraria MMO RPG, sorta like never winter knights. There would be a detailed character customization, a campaign/story mode, a sandbox mode and a mode where you can play mods/maps. There would be a multiplayer where you can join servers and the usual terraria things.
Its obvious! Why do you think you summon final bosses by stopping the cultists? ILLUMINATI WILL SUMMON MOON LORD IF U FIND THEM! and.... Cthulhu.