Thank you for your feedback! You made a lot of really good points and I want to address them, if you'll bear with me. First of all, I guess I should have made her role clear. My'reia is similar in appearance to a wraith, cloaked by shadows. Her spells are very dark, with most of them involving some dark forces in their animations. She is meant to be a sort of lower-damage utility mage, excelling in impairing enemies movements while putting moderate damage through from the backline.
I agree that her passive was a bit lackluster. It does more or less what I wanted it to do, but it lacks clarity and it seems hard to proc. What about this?
Abilities:
Passive: Death's Grasp
Every second that an enemy has impaired movement caused by My'Reia, she gains a stack of "Death's Grasp". At 6 stacks, her next spell will deal 2/4/6% of her target's max health as bonus magic damage.
Her Q, upon reflection, is definitely a bit much. The stun would create some very difficult to avoid CC chains involving her cloud. I have an issue though. I really want it to do some amount of hard CC. Not a stun, it would be too much and it wouldn't make sense thematically. A silence could work, but there is the issue of being thematically correct again. I suppose a root could work. What about this?
Q: Suffocating Tendrils -
Range 600
Mana Cost: 70/75/80/85/90
Cooldown: 16/15/14/13/12
Dozens of black, writhing tendrils erupt from the ground below target champion, rooting them for .5/.75/1/1.25/1.5 seconds and dealing 130/160/190/210/230 (+40% AP) magic damage.
Following the idea of her being a moderate damage CC-monster, the shield is also a bit much. Let's remove it altogether.
The E. Oh boy. So here's the thing about this. It's supposed to be an extremely strong zoning tool. I made it a bit too strong. You said it reminded you of Cass's shroud. Exactly! That's what it's supposed to be. It's supposed to dissuade enemy champions, really make them think twice about walking into it. That being said, it is really strong. I made it a bit too much so. How about this?
E: Choking Storm
Range 600
Area Of Effect: 350
Mana Cost: 60/65/70/75/80
*Cooldown: 12/11/10/9/8 18/17/16/15/14
My'Reia hurls a swirling ball of corrupted energies to a target area. It creates a cloud that lingers for 6 seconds, dealing 130/140/150/160/170 (+10% AP) per second. It also slow enemies inside it's radius by 20/25/30/35/40%. If any enemies remain in the cloud after 4 seconds, the slow doubles. If any enemies remain inside it the entire duration, they are stunned for 3 seconds. If any enemies remain in the cloud for over 4 seconds, they are silenced for 1/1.25/1.5/1.75/2 seconds.
Ahhh, the ult. I really just had no idea what this was going to be. I had a clear idea of the rest of her kit. This, not as much. I'm going to take another shot at it. What do you think of this?
R: Embrace Of The Elder Things Destruction Of Mortality
Range 800
Mana Cost: 200
Cooldown: 160/140/120
Darkness erupts below target champion, knocking them and any champions within 300 units of them up for 2/3/4 seconds. During this time you are free to move around cast spells as normal. After the knockup ends, a dimensional rift opens and a mass of writhing tendrils resembling a meteor comes through, slamming into the ground and dealing 250/350/450 (+60% AP) to any enemies within 500 units of the initial target.
Darkness erupts below target champion, rooting them for 3.5 seconds and dealing 100/200/350 (+30% AP) to them. The darkness then spreads to any enemy champions within 300 range of the initial target, dealing 20% less damage for each champion it spreads to (maximum of 1/2/3 extra targets) (the root does not spread).