Saidan Dathrohan by Gluin

Base hp: 1704
Base attack damage: 120
Base attack speed: 1.0
Base mana: 740
Hp regeneration 3.4
Difficulty: Medium (?)- the only real difficulty of this hero comes from managing the stacks of Dark Presence and knowing when to save it for, which also is the main part of the hero's fanatsy (saving this "revalation" for the correct moment)

The numbers are placeholders and should be adjusted to balance the performance.

Level 1

[Q] The Scarlet Crusade: Crusader Strike now gives 4 stacks of Dark Presence
[Q] The Crusade Marches On: Reduces the cooldown of Crusader strike by 1 second.
[W] Crusade of Glory: Reduces the mana cost of Word of Glory by 15.
[Passive] Submission [quest]: Turning into balnazzar reduces the stacks needed to transform next time by 2. Reduction maximum up to 40.

Level 4

[E] Unbound Freedom: Successfully removing a moevement imapring effect with Hand of Freedom reduces it's cooldown by 6 seconds.
[E] No Choice: Increases the duration of slow effect of Hand of Freedom in Balnazzar's form by 4 seconds.

Level 7

[Q] Aftermath: Crusader Strike increases damage of next 3 basic attacks by 15%.
[W] Devoted to the Cause: Healing the same target twice in a row with Word of Glory, increases it's healing the 2nd time by 20%.
[E] The Light Cleanses: Hand of Freedom also dispells friendly targets of all damage over time effects.

Level 10

[R1] Lasting Corruption
[R2] Sleep

Level 13

[Q] Purge the Wicked: Targets that are slowed by Hand of Freedom take additional 15% damage from Crusader Strike.
[W] The Light Abandons No Man: When transofrmed you can heal yourself with Word of Glory.
[Trait] Looming Presence: You keep 33 stacks of Dark Presence upon dying.

Level 16

[W] Redoubt of Light: Word of Glory now has 2 stacks
[Q] Stunning: Crusader Strike now also stuns the target for 0.5 seconds.
[E] Freedom Is Freeing: Hand of Freedom now also increases the movement speed of your target by 20% for 4 seconds.

Level 20

[R1] Spreading Corruption: Transforming into Balnazzar increases the damage of nearby allies by 15% for 4 seconds.
[R2] Eternal Slumber: Reduces the duration of Sleep on target to 5 seconds but the target cannot awaken by the damage you deal.
[Trait] Grand Crusader: Increases your auto attack damage by 15%
[Trait] Army of the Damned: Each allied hero near you increases your ato attack damage by 6%

Again, nubmers may and should be tweaked for better balancing.

Base skin would be inspired by his gear from Vanilla WoW dungeon, with some major texture updates.

Lvl 10 skin would be a more buly version of the basic one, specially his sword, his headgear and his cloak.

The corrupted skin would be his base armor, but obviously damaged, stained. His skin would be grey/greenish, his eyes would shine blue. Would feature new voicelines aswell.

Base voice lines:
Upon killing Uther: You were never truly devoted.
Upon killing Arthar: Unworthy filth.
Upon killing Anub'arak: Another abomination falls.
Upon killing Stitches: Another abomination falls.
Upon killing Gul'dan: Why did we ever need you?
Upon killing Sylvanas: *evil laugh*

Entering battle with Uther: In Light we are one, brother.
Entering battle with Sylvanas: You'll do. For now.
Entering battle with Arthas: Fight well, young one.