Kel'thuzad (Complete!) by omigawail

Skeletal Longevity: Increases the duration of raised Skeletons by 10 seconds
Unholy Strength: Increases your Ghoul's basic attack damage by 100%
Drain Essence: If your target dies while under the effect of Drain Soul, you will gain the rest of it's mana.
Sacrifice Ritual: Summon Ghoul now restores some of your health.

Obsidian Statue (talent ability): 60 second cooldown. Raises a statue from the ground. The statue grants nearby heroes 20 mana per second. Lasts 8 seconds.
Expanding Army: Increase the skeleton cap by 1.
Health Leech: Soul Drain now also heals you for half the damage dealt.
Gnaw: Ghouls gain a charge ability that roots the target for 0.5 seconds.

Skeleton mage: One of your raised skeletons will be a mage. Mages have ranged attacks and deal more damage.
Vampire Ghoul: Ghouls will be healed for 75% of the damage they deal.
Master Channeler: Allows you to channel spells while moving.
Mana affinity: Soul Drain grants you double the mana.

Cult Of The Damned
Shadow Fissure

Scouting Shade (talent ability): Summons a Shade at the target location, revealing a large area. The Shade is cloaked and will disappear after 30 seconds.
Suicidal Ghoul: Ghouls explode when they die, dealing damage to nearby enemies.
Thirsty For More: Regeneration Orbs give you double Mana.
Shadow Ray: Your Auto Attacks deal 50% more damage and their range is increased by 100%.

Aura Of The Dead: Increases the movement and attack speed of nearby Skeletons and Ghouls by 100%.
Aura Of Leech: Each time an enemy is killed nearby, you gain one stack of Leech. At 5 stacks you are healed for 5%. Heroes count as 5 stacks.
Aura Of Shadows: Deals low damage to nearby enemies.

Master Cultists: Cultists don't despawn and will march with their skeletons until they die. They are able to use a non-talented version of Drain Soul.
Void Fissure: Shadow Fissure places a curse on enemies that deals damage over 5 seconds to enemies within before exploding. 1.5 seconds after placing, you can active the spell again to immediately detonate Shadow Fissure.
Bolt Of The Storm (Talent Ability): Activate to teleport to a nearby location.
Enhancing Ghouls: Ghouls are now surrounded by the aura you selected. 

Ranged Specialist:
Difficulity: Hard

Maximum Health: 780 (+115/level)
Health Regen: 1.6 (+0.30/level)

Maximum Mana: 640 (+10/level)
Mana Regen: 0 (+0/level)

Attack Damage: 0.75 per second
Attack Speed: 46 (+8)

Pros:
- Effective Multi-lane xp soaking.
- Great at soloing mercenaries.
- Summons are great cannon fodder.
- Can manipulate his army of skeletons and soak xp even when dead.
- Able to scout the whole battlefield without being detected.
- More mana that any other hero.
- If properly talented, has great self healing.
- If talented, can attack towers while out of range.

Cons:
- No mana regen, must use Soul Drain.
- Lacks a mount.
- Skeletons are weak against AoE damage.
- Very hard to micro-manange.
- Extremely low mobility.
- No escape until level 20.
- Lacks any CC abilities.
- Vulnerable to CC abilities.
- Channeled abilities can be interrupted.
- Skeletons cost a lot of time and mana to summon.
- Weak in team fights.