Kasdin is a High Elf Rogue who specializes in political subterfuge. He met the Keepers of Eight when they captured the airship he was being held prisoner on. He then revealed himself as a member of The Oath and, finding their goals aligned, agreed to help them. Kasdin is described as being an older looking elven man with typically pulled-back white hair, somewhat olive-toned skin, and a small triangular goatee.
Kasdin and The Professor are officially an item as of the latest episode (5/6/19).