Wicht said:A Nilbog is a goblin with a strange magical condition that causes people to act strange and backwards to how they normally act.
This sounds like a mind-affecting compulsion, as opposed to a time-reversal effect. I'm having a really hard time figuring out how it would interact with spells and spellcasters... Could you give me a hand coming up with the mechanics for this wee beastie? I don't have any experience statting monsters up yet, and I wouldn't want to disrupt the game experience by ineptitude.
Maybe someone summons the Nilbog from a chaotic plane? I'll have to apply some brain juice to this one! There's definitely a fun story in there - thanks Wicht!