The backstory provided by DotA tells of Kael, The Invoquer, embracing the Lich King's dark magic to exact revenge on the Sentinels, wich, it can be assumed, are guilty of "breaking and scattering" Kael's people.
It also speaks of the "Blood Mages" as an ancient school of magic/order of mages. Revenge looks like the easiest of most fitting theme.
All that said, the first things that come to mind are the Spaghetti Westerns.
Their stories are ussually pretty simple. Focused on few characters, their "in the moment" personalities and the way they relate on-screen throughout the movie; quite opposite to for example, The Lord of the Rings, full of different characters and all their backstories explained as thoroughly as possible.
Following this scheme, Kael could reveal his real motive close to the end of the story (if that's the case, you should come with another reason for his revenge, like the death of his wife or the treason of his brother besides the defeat of his people). The main Antagonist should be revealed early on and have several encounters (not necesarilly battles) with the Protagonist.
It's a must that the characters closest to Kael should be untrustworthy and at least one HAS to change sides easily.
To every "lone gunman" and "man with no name" there's the "damsel in distress", of low moral sense or unethical profession, that sparks love and the sight of a distant hope in the troubled protagonist.
The other side of the "revenge coin" is the Montecristo/Assassin's Creed 2/Dishonored/19th Century style. With a, at least 2 times, more complex story; a whole lot slower; and a whole lot more characters (with greater backgrounds).
(*breathes*)
What is (most likely) the opposition of revenge as a theme? REDEMPTION!!!
For example, the story starts with Kael exacting his revenge on the Sentinels
Do you want to sttart with the end?!
The answer is: NO...
After completling his vengeance, Kael, finds nothing to live for (In Kill Bill, the Bride, finds her daughter, thus filling that void; she finds something better to live for). And that would be Kael's quest: to find something worth living.
In his quest, he sees the consequences of his mindless actions. He finds all the people whose lives he's ruined; he is deserted by his people when they see his incontrollable rage and bloodlust, when they realise the selfishness of his actions.
The one thing that pops to mind related to this theme is, Tales of the Jedi, the "Redemption" story arc.
Tales of the Jedi is a comic book series set in Star Wars around 5.000 years before SWIV when the Jedi meet the Sith for the First Time. There, the protagonist "does what he should" (no spoiler!!!) and is exiled to a deserted snowy world. At age 50-60 he's found by the daughter of "an important character" as he faces ultimate redemption.
Bottom-line: I think Revenge and Redemption are best suited for this character. Of course, you could go for a "rise to power" (Scarface, Joan of Arc) kind of story or even a tale of romance and tragedy (Romeo & Juliet).
The choice is yours.
I'm sorry the post is so long. I kinda got carried away.
Either way, Good Luck!!!
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