Up front, it's safe to say that a change for this ability was needed ever since it was first implemented one year ago.
The complaints back then were a combination of multiple things starting from the overall lack of power on the skill:
All you get is a snare or depending on the morph a root in each circle along with applying minor maim.
You could also choose to give empower to 2 of your available pets however only for one tick and it's impossible to reliably hit your pet and an enemy.
Along with all this the skill is also really important.
That's it you don't get anything else, no damage, no buffs, nothing, compared to other skills with equal effects like encase, talons or bombard this skill simply can't compete at all.
Encase gives up to 8 seconds of the strongest healing buff in the game or reduces its cost if you don't hit enough people.
Talons will root a lot more players while dealing regular AoE damage and either apply minor maim too or add more damage with a dot.
Bombard covers a big Area, deals the AoE damage standard and roots players.
It's clear at this point that there is no reason for grave grasp to be used.
Now the skill was changed to have 3 different effects for each circle.
However this doesn't help at all with any of the issues mentioned above, in fact it makes some things even worse.
The newly added stun is incredibly unreliable and can't be controlled at all in pvp, you have a huge gap between you and the circle that stuns.
Meaning enemies that are right on you are immune to being stunned.
The two new morph effects don't help at all either, changing the empower to last 5 seconds still leaves you with the issue that either you target your pets or you use it on an enemy so no matter what you lose out on half of the effect of the skill.
The other morph adds additional duration however in PvP no one will sit in the root or the stun till the duration ends making this morph not worth the skill point spent.
After all this ranting here's my proposal on how to make the skill better and actually useful.
The main point is splitting up the morphs in two different archetypes:
One morphs is single targeted with skeleton arms crawling to the enemy and pulling them off their feet (ignores block but not dodge)
Also deals 1/2 of the single target spammable standard as damage and applies minor maim
The other morph retains the mechanic of three circles.
The first enemy you hit gets stunned, the next gets rooted and everyone else gets snared.
The circles also consume bodies and deal damage equal to streak when they do so.
This makes the skill strong enough to compete with other equivalent skills while also helping necromancer to strengthen its body mechanics and gives Necromancers the option to either go for more damage and more utility vs multiple players at the cost of absolute control about the stun while still having some vs being able to control the stun and gaining more damage vs a single opponent.