I have finally won with ascetic Qamar after so many tries most of them dying to the final boss due to the inability to burst him down and/or him killing you with 2 hits before you gained enough stacks.
Speaking of stacks this build relies on gaining effects via standstills like focus from the Ascetic class and repulsions from psychokinesis and master repulsion to abuse Qamars ability twice per standstill to deal massive amounts of astral damage to enemies in a 2 tile range, while psychokinesis targets enemies at a much farther 5 tile range increasing the builds dpr and providing an early "long range" damage output. I chose Hadad because of the healing prayer and especially the +5 speed, Humbaba is also a good pick but Hadad is simply better because the focus increases the bleed damage is increased by focus, which is how I lost my last run before this one.
Purple mage head cap provides damage at infinite range targeting any enemy on the map as well as dealing more astral damage since it is a separate astral damage source. Purple blue sash is amazing since it not only deals a lot more damage but it also bypasses the astral and psychic damage resistances, but the strongest item equipped is the robe of the astral wanderer. As you can see from the picture the build completely uses dex (I'll explain why later) and the robe increases both astral damage and psychic damage by 3% per dex, meaning with 37 dex the damage increase is a whopping 111% percent more damage. The weapons are a bit unoptimal since I didn't get the icon of the mysterious order and I chose the robe of the astral wanderer over the icon of the astral wanderer.
Now for the reason why this build chooses mostly dex is simple, you get more turns than your opponent due to your massive speed which means you deal more damage AND most importantly gain more stacks of repulsion and focus to trigger Qamar and increase all of your damage. At some point you will be able to reach 5 bars of effects while destroying an entire boss level and not take any damage all just by standing still.