I've watched one of Direwolf20's Let's Play vids of the Season 9 Direwolf20 pack, specifically, the episode where he builds his rainbow generator, and I noticed a brand new status debuff that appeared in the game. When he gets too close to the undead generator while it's running, he gets a new debuff effect called Doom. This made me curious: What exactly is the Doom status effect and what does it do? Also, from what mod does that effect come from?