The video as promised @CodeMage @LZB_Gattsu
I do not think I am showing amazing fighting skill at all in that video, just aware of my surroundings.
The most skillful part was my positioning at the very end of the bossfight to dance without getting hit 
I mostly played archer to support the main character, aka. OMEGALUL the Greater Sabretooth 
Of course I sometimes cleared stuff myself, especially when some NPCs went for me, and I waited a bit for OMEGALUL to regenerate HP before engaging Thag.
Just went with full buffs, Skelos Master Armor, Legendary Agility Weapons, and you can see I didn’t plan everything and I wasn’t sure about this at all because of the sh*tload of Serpent-men Arrows I brought with me, as well as the amount of Blood-Sausage I put in OMEGALUL’s inventory for healing 
Thag Bossfight starts at 20mn if you wanna skip to that 
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