Nightmare

Nightmare is a replica of the antagonist of Five Nights At Freddy's 4. In User Battles: Recharged, he is the replica of Solomon, though he has had other owners in the past seasons.

Destructive Power of Darkness
When Nightmare falls below 30 HP, he sacrifices most of his defense as well as some speed in exchange for one final adrenaline boost in the form of an attack increase.

Usurper's Finale
Nightmare becomes encased in Titanium, maxing out his defense but heavily slowing him down. The initial armor-up also causes a sudden rain of molten metal that can damage all enemies.

Trivia

 * Nightmare is one of the few animatronics that have a kill screen instead of a jumpscare, although he got one in Ultimate Custom Night.
 * He is a palette swap of Nightmare Fredbear, and is also slightly transparent.
 * Solomon replaced Stone with Nightmare when he overtook Paladin Maxwell's spot.