Yes, Hypnotic Pattern will work in darkness. Though there are no rigorous guidelines over it, the spell’s resources include a “glowing adhere of incense” and “phosphorescent content,” indicating the twisting pattern of colours produces a lightweight present outcome that features even in darkness. en: Conjuros, Conjuros de nivel 3, Conjuros https://www.youtube.com/shorts/2bqrDoavYZM