You were trapped by the mind control powers of the Illithids (Mind Flayers) for who knows how long but were finally able to break free of their control. Doing so has given you extra resistance to psychic attacks and mind control and finding your way out of the Underdark has given you some ability to sense in the dark.
- You gain resistance to psychic damage
- You gain proficiency in wisdom saving throws
- You gain blindsight for 30 feet.