- Decipates you, then waits for you where you spawn
- Spawns after Skeletron was killed
- Spawns in areas that don't have dungeon biome such as: corruption, floating islands, forest, underworld, and stone layer.
- Spawns and dies as soon as it touches you
- Gets stuck in blocks (entirely)
- Doesn't spawn at begging of new world
- Spawns and dies immediatley
Flails (sunfury, blue moon, ball o' hurt):
- Goes through 1 layer of blocks that are underwater
- If teleported in multiplayer and still out, you see a very long chain (depending on where you got teleported)
- Dungeon doesn't spawn
- Day and night enemies spawn switched
- Time stops
Thats all I found while in game.