Xenoblade Chronicles X
So I have all the hard to get materials for the Ares 90, and I got an incredibly strong Phoenix and G-Buster weapon. However I somehow got OHKO'd by the Telethia Plume during the nemesis mission and didn't realise so now I'm down to 1 Insurance on my Lv50 Amdusias which means that if I fail the button press one more time I lose it, which sucks. I'm only Level 55 as well so I need to reach 60 before I can even use the Ares 90.
edit: I just got the Ares 90. This thing is so fucking badass, I've been waiting for something so crazy powerful like this the entire game, I can go anywhere now and just wreck shit. I can't wait to deck it out in augments and upgrade its armour. For now I think I'll grab some really good ground armour and try and make the Ether Blossom Dance build for my character. Some player recruited me to do a multiplayer mission with them, then she just handled it while I watched and occasionally used bind on Telethia Plume. The other guy did the same thing. Thanks to her I got some really good items and just a ton of RP. Also I got two achievements related to killing the Global Nemesis 300 times.
This game is so good. I don't think I'll bother with a Custom Skell even though it can potentially be stronger than the Ares 90, it's a lot of grinding and I adore the Ares so I might as well stick with it.