Misa

From The Heretic Knowledge Vault

Seen here and for the first time outside of her armor. She appears to be an old acquaintance (or possible sister) of Sarine Elle and is a member of the Viradior. She is also apparently still considered a child at 1500 years of age, though this may be because she's the youngest elf in the city.

Also appears: here. We probably haven't seen the last of her, as she's doing Sarine a favor.