How well would he do?

How well would Arthur Pendragon from Nasuverse do in the Shadow Slave Universe?

Includes having an Excalibur, Avalon, and as he was at his peak before going to the throne of heroes, but he still gained the experience of each version of himself where he is more human than he was while.ruling Camelot

. His only goal is to save what's left of humanity and judge if the legacy clans should continue to exist.