Davian Thule
Captain Davian Thule (Also known as Davian Cool) is a captain of the Blood Ravens chapter. He appeared in Dawn of War Dark Crusade and throughout the entire Dawn of War II franchise, where he lost sorta lost his accented voice, sounding a bit gruff, and got interred into a Dreadnought afterwards.
Dawn of War
Thule first appeared in DC as the commander leading 3 companies of Blood Ravens to secure the planet of Kronus to secure knowledge that pertains to their chapter's history. He was victorious in the end but had his eye poked out when he fought with the Necron Lord there, it is theorized that the Cron lord also got his throat, explaining why he lost his sexy accent in DoWII. In his victory, he found certain relics and information about the Chapter's past and it changed how he looked at the Blood Ravens forever, which would indicate that the whole prospect of the Blood Ravens stemming from a Thousand Sons cult is true or he found Kyras' stash of /d/ themed porn there.
Dawn of War II
Captain Thule then returned in DoWII, leading the forces on Calderis. He's so badass that all he does is mounts on top of a hill and starts shooting everything with his heavy bolter without flinching, just to show everyone that he's awesome that way. Much later during the Tyranid incursion, he was mortally wounded and poisoned by a Tyranid warrior and was put on stasis to prevent the poison from utterly killing him.
There's a mission on Typhon that requires you to obtain a Tyranid bio-toxin sample as so Apothecary Grodian can create an antidote for Thule and for a certain poison to kill the Hive Mind. After you get the bio-toxin sample, he deep strikes as a Dreadnought in the same mission to help you battle the Tyranid Hive Tyrant that appears there. After that' he's pretty much available for use in any mission you desire, and boy, will he mess up anyone's day. Give him the ability to self-repair, venerable status and optimize him to be either choppy or shooty (shooty is a bit better), and watch him plow through everything like an IG Baneblade against a lame Cultist rush. He's an invaluable assets for some of the hard-ass bosses like Warboss Bonesmasha and the Avatar of Khaine and is tied with Cyrus for being the most useful member of your team.
With an assault cannon and hellfire rounds and a mighty strike, he can very quickly obliterate large masses of enemies, sweeping away everything at a distance and sending anything that gets close to him flying and get stunned, and if he does take damage; just activate his absurdly fast self repair and watch him start up the rampage all over again, hell he can even charge and send everything in his path flying like bowling pins. And the upside to all of this? All of these abilities recharge very quickly.
Chaos Rising
Thule returns later in Chaos Rising, still as a Dreadnought. He can't be corrupted like the other squad members but will permanently leave your squad if your hair-etical force commander starts being too heretical. He's basically the ace-in-the-hole for all your missions like in the last game, he can tank and screw up the hard bosses in levels like Araghast the Pillager, the second Eldar Avatar of Khaine, if you're pure until the end, Martellus' fucking Chaos Predator (FUUU!!!!), and motherfucking Ulkair (MOTHERFUUUUU!!!!). If you do trade him for a couple of tainted wargear and powers, you just screwed everything up because he's way better than most of the Chaos powers.
Retribution
Thule also returns in Retribution and probably for the last time in the series, he is also no longer playable. He's the target for Eliphas' first mission for revenge and is sadly killed. Many who depended on his sheer power and fluff will miss him and shed Manly Tears upon his death. This event lols the Chaos fans so much. We like to pretend that the Venerable dreadnought honor guard unit you can use in place of Martellus in the Space Marine Campaign is him. No we don't just pretend it's him, we know it's him...right? *sobs*