Unicorn (/ˈjuːnɪkɔːn/)
There was one seen in the Feywild, Session 31: Stop Hitting Yourself Report.
I really do try to make most of this original, but since Forgotten Realms is an integral part of the world I can't help if anything is used without formal permission, but is still "fair use" as I am just using this for my private games.