This is Darkrai the Darkness most powerful and most deadly form when he used all seven Dark Chaos Emeralds and all seven Chaos Fusion Emeralds. He become like a fusion of a Hallow and a Heartless and he become a giant.
Death Darkrai: eheheheheh
Seon: WTF BOOM
Power: Taste the rainbow mother fucker!
WHOA THAT ONE UGLY BIG MOTHERFUCKER but i ain't scared lol