Evil Santa can be recruited if someone in your party has low enough attitude to tell Santa to "PISS OFF!"
Alternatively, Evil Santa can also be recruited during an event if Santa is in your party. If your party is camping and there is enough room, Evil Santa may appear in your party. The player is not given a choice to not recruit him if this happens.
See page: Santa
If Evil Santa's morale falls to a critical level he will emit an ear-piercing scream and then explode into a flurry of snowflakes and glittery powder. This will cause him to die.
If there are any other party members after this happens, they will all inhale the "Santa spores." This has an unknown effect.