His Older Brother, Steve

His Older Brother, Steve is one of the Challenges available in The Arena.

Description
"I'd swear that that ol' alien king is showin' his face here again. But, he says it ain't him, and that he's really someone else. I can't say I believe him... but it seems like he's been working out. Show him the ropes just one more time, for me!"

Strategy
Finally, the last challenge, after which you can take your place in the pantheon of Metronomicon greats! ...ahem.

Imposter or not, what's definite about King Flavius/his brother is that he is slightly more resilient than the one you fight in Story mode. But, again, like the previous challenge there are no minions to fight. Use the same strategy that you used for Flavius - a stunlock build with Gwen and Sara will do the trick - and he should hopefully go down rather easily.

Congratulations, you've successfully beaten all the challenges in The Metronomicon! (That's assuming you read these strategies in order, unless you cheated and scrolled to the end, you sly cheater you.)