Kasamir is one of the last of the dusk elves, a subrace doomed to extinction after Strahd slaughtered all the women.

Kasimir, a mutiliated and grief-stricken dusk elf, has been trapped in Barovia for centuries. His people were on the verge of being annihilated by Strahd’s armies when they surrendered. Strahd left the few survivors to the mercy of the Vistani, who bore them to the valley of Barovia, where they have lived ever since.
He spoke of a place hidden deep in the mountains, the Amber Temple, which he said is rumored to hold old dark magic, such that may be able to return his sister from death.