Godskin Duo (RL1, hitless, no sleep pots, no upgrades)

This was a very stupid idea and I'm so pleased that it worked
I thought it might be both funny and doable to kill them with only Carian Retaliation (and a kukri or 10 where applicable) so I built around maximizing that damage.
Spellblade Set gives 2% per piece
Magic Scorpion gives 12%
Ritual Sword gives 10%
Since everything is multiplicative, that gives a passive boost of 1.334x. For the first three minutes, I have Magic Shrouding Cracked Tear for an extra 20%, giving a 1.601x multiplier. Without any kukris, this winds up taking about 40 "parries" to kill. (Golden Vow could boost this further, but I didn't want to deal with weapon/two-hand swaps, and it's pretty FP hungry.)
Another nice thing about this is that CR doesn't scale with your INT or your upgrade level, so this is viable for anybody doing an RL1+0 run-it would look equivalent to this.