Yojimbo, the Fallen Shogun
From Wyvern Source
Yojimbo is one of the strongest enemies found throughout Wyvern and has a chance to spawn in RD floors over Threat Level 100.
When defeated, Yojimbo explodes into a massive pile of loot that is spread throughout its map. The loot that drops from Yojimbo can be claimed with Loot Tokens.
Yojimbo has a chance to drop blue, red, and gold Sokoban equipment, which makes Yojimbo-slaying a popular endgame activity.