New user here! Not even sure if this might be the correct topic, but let’s get to the point.
I am currently playing spellbinder and using clayvorant set.
I challenged Mogdrogen several times, and the battle went well and I was able to use Moe+Mot combo and sometimes I am able to facetank him (due to gracefull bat dev). However, everytime I brought him down to half his HP, he killed me one shot (I was around 9-10k HP) and it happened in a small cdr space between Moe and Mot. This happened several times and it seems I can’t defeat him.
I currently have 3100 OA and 2904 DA (permanent buffs only, without proc from Arcane will or clayvorant or devotions).
So it seems to me that he somehow buffs himself at half HP? Or am I just the unlickiest player of gd?
Cheers :
Welcome to the forum!
About Avatar: he indeed activates self-buffs which is:

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So I guess his dmg then comes from total dmg modified by%?
Also, 500 sec duration :(
Don’t forget his 40% damage absorption. You will do less damage and less life steal from him.
One question though. Will nulify work on his buff?
Only on auras not on passives. So it will not work on the passive that is enabled at 50% of his health.
If you are fighting him on ultimate difficulty, then try a lower difficulty. 
Mm. I managed to defeat clone of bourbon, lokar, mad queen. I think it’s possible to defeat him with enough kiting. Also, ravager of souls sometimes kills me.one shot, I’ve heard he has insane physical dmg.
Make sure that you have your lighting resistance overlapped by a large amount. Since he will lower lower it by a debuff.
You can purge that buff off i believe.