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Nightmare, the final boss, and you have to beat him to reset. Requires lv 20 to fight, so there's no real point in fighting him unless you want to be able to reset, or you're carrying someone through the fight.
Requires lv 20 to fight, and awards 25k exp, as well as the negativity badge which lets you reset.
Pretty easy on phase 1, phase 2 is harder and 3 is a survival
His indicator is the entire map gets a bit darker, though if you already run high graphics you can't see a change.
To get to him, simply move around. He can be accessed from anywhere on the map, just use any portal or elevator that changes the zone you're in. Fast travel such as igloos or the elevators in new home do not count, so don't try using those, though the chance of you being teleported there is quite low, and it can only happen while he's spawned.
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