Passage: After the battle, Bruce and Diana agree to set up a base of operations for the team, with room for more members. As the team is now established, Diana steps back into the public spotlight as a heroine; Barry acquires a job in Central City's police department, impressing his father; Victor continues to explore and enhance his abilities with his father in S.T.A.R. Labs; Arthur embraces his Atlantean heritage and continues protecting people on the seas; and Superman resumes his life as reporter Clark Kent and as protector of Earth as well. In a mid-credits scene, Superman and Barry have a friendly race to see which of them is faster. In a post-credits scene, Lex Luthor has escaped from Arkham Asylum and then recruits Slade Wilson to form their own league.

Question: Where did Lex Luther escape from?
Arkham Asylum