A simple, yet fundamental question:
Have you made the effort to test which one - (HP) or (ATK) is the primary multiplier from the damage based on (HP)(ATK)?
The mounting king shown in this picture has ridiculously low attack - 1432 + 1071...
He may scale off of HP, as part of the damage, but the attack part is still going to face the DEF part of the enemy, and I think(based on other games experiences), that in this game ATK battles with DEF as well, regardless of having extra multipliers.
Of course, as I asked, it is crucial which one of a 2 given multipliers is the main damage giver.
If I'm correct, I cannot test (don't have him), and his ATK is crucial part as well as DEF being in a sparring match with ATK, leaving what's left to be multiplied along with the HP... than, no wonder you might not hit as hard as you would expect and why you most probably will be ineffective versus highest of Arena teams, which all, including the ATK based champions would have high level of DEF.
Plus, why are you building him with Crit Damage set?
Build him with freaking Helm Smasher and Savage set and people will die left and right....
Yeah, I know, I don't have him, I don't know how big of a "garbage" he is... build him properly, right gear, right stats, right team composition and of course, find which are the champions that are his cryptonite... then and only then he can be titled "garbage" hero.
I mean, he has this HP for a reason, so you can put whatever gear you want, and with little to none hp% from substats to get decent HP while all along you have some savage ATK, DEF, Speed, or whatever and definitely a cool x4 piece set.
I've face him and hi hits like crazy. Especially if I need to focus on someone else... oh man.
So, once again, my question is - is his HP main multiplier or is it his ATK?
p.s. Enotpwnz is showing this screen shot for a reason - Mountain King hits hard and doesn't leave people standing.
p.s. 2 MASTERIES!?!? How do you build him, is it the proper mastery combo or not?