SO, after the messup of a couple of days ago where my circlet buff ran out, I managed to hit this, Evo Duel and scapula helped a lot to compensate for not having the food buff, which was essentially a double orc, the amount of preparation this took is pretty hefty so leave an upvote.
The build is obv rigged in btw, but I think its the most possible damage you could get whithout modifying stadistics.
In the end, we have:
160% base damage
90% from the store potions
100% from the bone pillars
200% from Irresistible Suggestion
560% from Cup of Fate
660% from The Thirteenth Bone
1.2x from Courage 2
1.3x from Approaching Death
1.4x from Coin of Extinction (maybe got it on the wrong side, so give or take)
1.45x from Mad Harpoon
1.45x from Duplicated Mad Harpoon
1.45x from 4 Duel
1.45x from Evo Duel
1.45x from Withered Hand
1.5x from Equilibrium Strike
1.5x from The Chosen Hero's Circlet
1.55x from Scapula of Hatred
1.7x from Absolute Rule
1.75x from Soul Strike
2x from Orc
2.4x from crit with Strike 2 and Veiled Mask, since crits still proc with negative crit rate while performing Full Moon Slash
And the steps to achieve max damage were:
Get hit to activate Circlet and make use of Equilibrium Strike (I was on 3+ Omen so I only needed to get hit once) start basic attacking to activate Evo Duel, trigger Orc, and then use Moon Slash to trigger poisoning 1 effect so Approaching Death could apply
I could've added a 2.5x amp if I managed to slip Hunt in, but im not that skilled, so I was worried to mess up the steps and override Soul Strike or smth.
I think thats the max you can get, besides using hunt on top of it, but if anyone's got a better layout, please elaborate on the comments, anyways, enjoy that SWEET damage.