She can also stack quite a lot of physical and missile resist and regen, which makes her suprisingly durable. On foot she's a good dueler, and on a manticore she can dive in anywhere and butcher by the dozen. Between her base stats, her various skill tree buffs, her legendary items and her activated abilities she's a veritable infantry blender.
Hellebrond herself is quite good in combat. Basically a decent faction buff in exchange for a regular slave drain, and the occasional bit of pocket money.