Boss slam mechanics are one of the most poorly designed and horrendously dumb mechanics in the game.
Shotguns? lol get slammed.
Melee debuffs? lol get slammed.
Tractor cannon debuff? lol get slammed.
Swords... LOL.
Melee supers? LOL GET SLAMMED.
3 freakin' times I tried to land my heavy fists of havoc jump attack (top tree) and EVERY time I got even remotely close to the Primeval I got slammed and thrown off the platform, completely wasting my super
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Swords can powerarmor through the slam with an aerial heavy attack, though the damage is so much ass that I still don't use swords in stuff like Gambit or Strike bosses.