Kel'thuzad by NFatcheese

Level 1

(!) Grim Harvest - Quest: Raise a Scourge Soldier for every 10 Regen Globes gathered when you gather a Regen Globe, up to 20 Globes.
Reward: Corpse Shield
Cooldown: 60s
Activate to sacrifice all nearby Scourge Soldiers and gain a shield equal to 5% your max health for each Scourge Soldier sacrificed, up to 50%.

(Q) Cemetery Recruitment - Raise Dead gains an extra charge and all charge cooldowns are reset when a nearby enemy structure is destroyed.

(W)Crippling Blight - Undead Plague slows enemy Heroes by 30% for 3 seconds.

(E) Rending Claws - Ravenous Ghouls cleave for 50% damage.

Level 4

(Trait) Scourge Recruitment - Friendly non-Mercenaries within the Shadow of the Necropolis deal 35% more damage.
50% like Merc Lord seemed too strong since you don't have to be present.

(Q) Flesh of the Master - Scourge Soldiers heal Kel'thuzad 15% of the damage they deal when nearby.

(W) Plague of Undeath - Undead Plague can now raise up to 2 Scourge Soldiers per cast when outside the Shadow of the Necropolis. Up to 5 can be raised when within the Shadow of the Necropolis.

(E) Unstable Ghouls - Ravenous Ghouls explode upon death, dealing 200 (+4%/level) damage over 3 seconds to nearby enemies.

Level 7

(Passive) Vile Rebirth - Kel'thuzad's summons heal themselves for 30% of the damage they deal.

(W) Corrosion - Undead Plague deals 50% extra damage over 6 seconds if cast within the Shadow of the Necropolis.

(Active) Ruthless Disposal - Cooldown: 30 seconds
Sacrifice a Champion of the Scourge and deal 300 (+4%/level) damage to target enemy Hero, slowing them by 40% for 2 seconds.

(Active) Cannibalize - Cooldown: 60 seconds
Destroy a minion and heal all Champions of the Scourge for 50% of their max health over 5 seconds.

Level 10

(R1) Mass Reanimate - Deal damage and raise Champions of the Scourge for Heroes hit.

(R2) March of the Dead - Send Scourge Minions down all lanes.

Level 13

(Trait) Death's Gaze - Enemy Heroes within the Shadow of the Necropolis are revealed for 4 seconds after they would leave vision.

(Trait) Unholy Renewal - Allied Heroes within the Shadow of the Necropolis regenerate 1% of their max health and 0.5% of their max mana every second.

(Trait) Blighted Land - Auto attacks slow enemies by 15% for 3 seconds if Kel'thuzad is within the Shadow of the Necropolis.

Level 16

(Trait) Immortal Servitude - Takedowns summon an extra Champion of the Scourge for each one that died in the last 90 seconds. If the Takedown was within the Shadow of the Necropolis, raise 2 Scourge Soldiers for each Champion of the Scourge raised.

(Passive) Terror - Destroying an enemy structure raises 5 Scourge Soldiers and 1 Champion of the Scourge.

(W) Domination - Undead Plague deals extra damage to enemy Heroes equal to 6% of their max health over 6 seconds.

(E) Feeding Frenzy - Frenzied Onslaught summons an additional Ravenous Ghoul. Up to 9 Ravenous Ghouls may follow Kel'thuzad at a time.

Level 20

(R1) Black Plague - Mass Reanimate deals an extra 100% damage over 10 seconds. Enemy Heroes slain while this effect is active raise an extra Champion of the Scourge. Enemy minions, monsters, mercenaries, and summons in the Shadow of the Necropolis that die while this effect is active raise a Scourge Soldier.

(R2) Army of the Scourge - All lanes now spawn Scourge Minions instead of regular minions. Scourge Minions have an additional 50% health and damage.

(Trait) Plaguelands - Dread Necropolis gains 2 additional charges. Up to 3 Necropolises may exist at a time. Reduce the cooldown of Dread Necropolis by 40 seconds.

(Passive) Phylactery - Every 90 seconds, Kel'thuzad may respawn after 3 seconds at his Necropolis when killed. If Kel'thuzad dies within the Shadow of the Necropolis while this ability is active, he only grants half the XP for his death.

Health - 1500
Health Regen - 3
Mana - 500
Mana Regen - 4.5
Speed - 4
Attack Speed - 1.1
Attack Range - 5.5
Attack Damage - 65

Update: 3/1
Based on feedback, I made a few changes.
- Moved Wrath of the Scourge to a numbered ability and made it able to target locations. Think Misha's controls. Self casting it also makes nearby Soldiers follow you, so that they can be used outside of lane like Zagara and Azmodan, but you still have to prep for that in lane.
- Replaced his E with a pair of mindless Ghouls that deal damage and last a short time. This helps make up for previous lack of team fight potential. The talent tree has also been updated accordingly.
- Made March of the Dead spawn a Champion when autocast by the Necropolis, allowing Kel'thuzad to get a constant flow of Champions for team fighting. Also lowered the cooldown significantly to boost the lane pressure in exchange for being useless in team fights. The Scourge Minions also no longer soak XP, I forgot that summons do that meaning KT would get ridiculous soak from March. Both ults now supply KT with additional Champions: Mass Reanimate more quickly for burst, March more steadily with minion waves. March seems it will always be the weaker ult because of its design, but it may have niche uses. And I like it way too much.
- Made Champions deal double damage to enemies hit by Mass Reanimate, to make it more powerful outside the Shadow. Also increased its damage a bit, now it does about the same damage as a Spectral Scythe on Xul.
- Buffed damage of Champions so that they are more useful since they're pretty hard to come by sometimes, especially pre 10.

Update 4/3
Small changes, mostly to Necropolis to make it less like Molten Core:
- Dread Necropolis now summons a Necropolis over an allied or destroyed fort or keep instead of replacing it. The Necropolis cannot be targeted or destroyed. The Necropolis is so critical to KT's play style that getting it killed would ruin him. I might need to nerf the bonus of the Necropolis since it's no longer able to be killed, but we'll see.
- Changed the Plaguelands talent at 20 from covering half the battlefield in the Shadow to adding 2 extra charges for Dread Necropolis and allowing for up to 3 Necropolises. The talent doesn't increase the range anymore, but lets you re-position the Necropolises more often.
- Mass Reanimate can now only raise up to 10 Scourge Soldiers per cast while cast within the Shadow.