My next task for the Dawnguard was to retrieve some sort of axe relic, and Agmaer rejoined me for this quest. He was clearly no Brutus though, nearly dying to some random night lord vampires near Deepwater Crossing. Fortunately I had his back.
I also had the vampires' back.
It's always good to follow through.
We stopped by Whiterun where I was made aware (as the acting Jarl) of some weapon the Thalmor were interested in an unremarkable cave to the South, so our mission quickly diverted to check it out. Bodies of adventurers paid by Thalmor gold lay near the entrance, and what seemed to be an ordinary bear in the first chamber turned out to be of the "killer" variety, slaying Agmaer in one strike!
I returned the favor to the beast then opted to go recruit more suitable assistance back at Death Mountain. The place was really running low on Daedric guards now, a fact a wandering ancient dragon was using to its advantage. With the other dovahkiin's Perdida, Zuna, and Tharas Gull we took it down after it landed and asked which of them was hungry for more adventure. Perdida jumped at the opportunity, and so with her in tow we returned to the unremarkable cave.
I always wonder how large caverns don't just naturally collapse.