Belvaer (Sindarin for Strong and Fit, literally Strength-excellent) can be found at Helethir in Dol Guldur of Mirkwood. As the commander of Helethir he's involed in several Raid quests concerning Barad Guldur.
- [...] Barad Guldur: The End of the Nightmare Raid
- Ingame this NPC is called Balvaer, in quests though they refer to Belvaer. It's the same NPC at Helethir.