In the description you said summoned hero has 2000 HP and in Level Stats you said 1500 HP at level 3
I am very much interested in this skill as: I like live
summoning skills very much
; Skill is quite unique (apart from reincarnation)
So lets make this a bit better as it is overpowered right now.
Remove the HP regen Aura.
Make HP's around:
lvl 1: 500 HP, Blocks 50% Damage, lasts 25 sec.
lvl 2: 850 HP, Blocks 60% Damage, lasts 35 sec.
lvl 3: 1350/1400 HP, Blocks 70% Damage, lasts 45 sec.
Now you may ask why such a change?
A: A direct jump from 600-1000 at level 2 seems weird imo.
1400 HP at level 3 and 45 sec cooldown is ok. But if people still think its OP then make it 25/30/35 sec.
If still people think OP then reduce damage block to 40/50/60 instead.
Now for the Model:
Have you thought of a model yet?
Check out Warcraft 3 Models
Be sure to check out all pages. And also make sure the model you chose looks like a "summon" and not a "hero".