Dawn of war 2 dark eldar
It's to the point where running a campaign with Adrastia on the field is something of a Self-Imposed Challenge. Doubly so as the honor guard that replaces her is a squad of Stormtroopers, late game high tier infantry who can turn even a Bonus Boss into a joke when armed with Meltaguns.
A member of the Ordo Hereticus, she is willing to use any means necessary to investigate the charges leveled against Chapter Master Kyras, including working with Xenos and wielding forbidden weaponry. A friend of Gabriel Angelos, she is the one he turns to to halt the Exterminatus of the subsector.