Maplestory "High Five" Private Showcase

The only commander we don't have a proper boss fight for, is Will,The King of Spiders (who you may remember from Zero's storyline, he's listed as having survived his encounter with them; so he's still an active commander)

Well and I guess Arkarium if you want to be technical (since its heavily implied he's merely toying with you in the current boss fight with him)

I feel Arkarium at his full power would be better suited as a penultimate boss right before the Black Mage though, given that he's his right hand man.

And how about Hilla, round 2? If I am not wrong, she appeared in the last storyline... And she is insanely powerful too...

Or maybe... a massive improved Boss Rush?