Necropsis; The Skeleton Queen

I was messing around with some cousins and they started yelling "REVIVE" after I got one of the two out, which was really annoying, but also inspiring. I started thinking of a revive based Bot Laner. I introduce to you, Necropsis, The Skeleton Queen. Sorry, but I don't have any art. Feel free to make the model and lore as you please.

Base Stats: 400 health, 2.5 regen, 350 mana, 3 mana regen, 57 AD, .5 AS, 325 MS, 525 range

Passive: Hell's Disease of Bone - Necropsis' basic attacks give enemies hit a disease that fades after 2 seconds of not being damaged by Necropsis. The disease reduces movement speed by 20% and increases damage taken by 10%, stacking up to three times.

Q: Kamikaze Skeleton - 9/8/7/6/5 second CD, stores 3 charges, 20/25/30/35/40 mana. Sends out a small, cursed skeleton in a direction, exploding after reaching max range, contacting an enemy, or having the key pressed again, doing 100/150/200/250/325 magic damage in a small AOE.

W: Marrow Sacrifice - Passive: Every 15 seconds, a Skeletal Minion spawns (200/250/300/350/500 health) Active: 20/18/16/14/10 second CD, 90 mana. Sacrifice all Skeletal Minions (max 3) to gain 40% of their current health instantly.

E: Earthen Skeleton - 19/18/17/16/15 second CD, 50/55/60/65/70 mana. Creates an unpassable, damageable wall in an area.

R: Rise of Allies - Passive: Nearby ally champions have +50% regen while off cooldown. Active: 200/180/160 second cooldown, 50% of max mana. Take control of a nearby ally's corpse for 15 seconds with full access to the entire kit of the ally (excluding the ultimate) after channeling for 1.5 seconds. Necropsis goes in to stasis for the 15 seconds, but can be damaged. If Necropsis dies before the ability ends, the ability ends immediately.

That's the concept. Tell me what you think, balance changes, anything.