Spawns nightly, watching from a distance, one of the mod's three bosses.
Once World Corruption reaches Level 3, Integrion spawns once each night, sometime between 13000 and 23000 in-game time, with a random animation, facing the player.
Getting within 5 blocks triggers one of three outcomes: bedrock appears beneath the player, the player is teleported to Integrion's position, or the player is kicked with "You still have some time..." Before a kick, the entity vanishes immediately rather than lingering, and will not spawn again that same night, only the next one.