Currently running prestige leviathan, we are attempting the final boss with the Arsenal perk, after a handful of attempts we were midway through when I think I dodged or something at the perfect time because I ended up with 0 ammo on all weapons making it impossible to do damage which was pretty unfortunate.
EDIT: We wiped, not enough dps for the weak spots....
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Meanwhile, if you really love Riskrunner, you can self damage with Arc and have ammo for it all the time, even build up a reserve.