LF: Help killing Invincible Sentinel + Loot

I’m looking for someone to either completely kill the Invincible sentinel for me or help with it. I’m a level 65 Wilhelm.

Also looking for a spare Prismatic Bulwark shield of the same level. Don’t have much, if anything, for trade as my luck is garbage when it comes to drops usually.

GT Gringo355
Usually always on.