Chaos Elfilis
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Chaos Elfilis is a secret boss encountered exclusively at the end of the Colosseum's Ultimate Cup Z mode, serving as the final boss of that mode and therefore the last boss of the entire game. Despite not having the suffix "soul" (Due to the title having been taken by Soul Forgo who is subsequently absorbed by Morpho Knight at the end of Isolated Isles: Forgo Dreams), Chaos Elfilis shares many similarities with other Soul Boss, as it is an amalgamation made out of Fecto Forgo's, (Presumably) Morpho Knight's, and some members of the Beast Pack's souls, among others.
The first phase of the boss is largely the same, however