Railgun Spider Beetle

The combo of Exorcism and Fatal Wound to kill is insane, paired with the sustain from neutral/bleed with Transfusion is great.

What makes it really tanky though, is Packuran's ability to stack defense when using its shift/tertiary ability while charging up your secondary.

The part of the build that truly outputs the massive burst damage needed to oneshot most enemies and delete over half of most bosses' hp is in its second ability, specifically, the Sniper Shot. It allows you to choose which enemies to put the hit mark on, and makes that mark do more damage when it is triggered, stacking with itself and Exorcism along with the insane crit damage from the Catalyzers. For even more damage, you can stack the damage buffs from using its shift ability while using your primary, as well as getting the 5 stacks of cooldown from the Sniper Shot whenever you trigger the hit marks.

In effect, you get 5 stacks of defense, attack and cooldown, just from using primay and secondary in conjunction with the tertiary, allowing you to stack up the damage and crit with the Catalysers.

Just make sure to always keep your defense stacks up though, or you WILL get obliterated like I was at my last level in the abyss, and try to avoid using your ult, as using it too long will let you run out of defense stacks and not enough time to stack them up again.

I hope you enjoy this build, it took me a long time to get it to its current state!
Enjoy everyone's favourite spider/crab/beetle.
Cheers