Xenoblade Chronicles 2 Playthrough Part 62 (EXTRA #5 - Ophion, Pernicious Benf, and Mk. VII Arek)
With everything else out of the way, it's time to take on the last few superbosses before moving on to New Game Plus! Artifice Ophion was the hardest superboss for me. He's completely immune to Driver Combos, so you have to rely primarily on Blade Combos and Chain Attacks. Ophion has a few hard-hitting AoE attacks that can be bypassed by using a Level IV special's invincibility frames (or a Blade Combo as you're about to finish one). For an easy win against Ophion, using Pneuma alongside a gigantic Chain Attack is definitely the best way to go. Pernicious Benf was the second hardest superboss for me. He's got a few annoying AoE moves and PLENTY of health. Unlike Ophion though, you can perform Driver Combos on him. Mk. VII Arek was actually the easiest superboss for me outside of Reeking Douglas. I heard that its companions can summon more reinforcements, but.. they never really did for me.