Hmmm… i guess im back to the drawing board
it seems that i made the concept more complicated than i thought… well Thank you for the review everyone!!
So going back, i have a question, what do you mean by Maiev’s talents that relates to Grom’s trait? Sorry i got a bit confused there 
Second, The Blood Curse ability is basically Dota 2s Axe’s Ability Battle Hunger, its the reason why the enemy hero needs to kill in order forthe debuff itself to end so that the unit doesnt take DoT effect any longer, and they can do it “After” the Taunt or Fear is over.
For the Gorehowl’s Deathblow, again this is Dota 2s Axe’s Ability Culling Blade, in which i thought its perfect for Grom due to his lore destroying Mannoroth with almost one strike, although you do have a point on the rescailing of his backlash damage so that it doesnt have any similarity to the other said heroes’ ult, also whos GM? Just asking 
The Mak’Rogahn, is again (so sorry
) basically Dota 2s Legion Commader’s Ult, Duel, in which Grom and the enemy hero battle each other with basic attacks (since both cant use abilities, kinda like Silenced) whoever dies or deals more damage, wins and gain permanent bonus power!!! I dont see any reason why this skill wouldnt work and be implemented on hots? I mean its not that complicated… (i think
)
And lastly for the Soul Gem, its passive just reveals while Grom is being revived, much like Medivh’s Dust of Appearance, i didnt meant to make it look or sound like it reveals stealth heroes “All” the time, (though i wouldnt mind that happening if it against Valeera or Nova
)
Ahh okay, i’ll try to Buff the effects of his W and E abilities in chaos form, i did tried my best of implementing his original skills in WoW, especially his “W” ability Hellish Roar. In WoW, the Roar he makes always crits so thats the reason why its like that…