10 minute cooldown (must be Google Lens translator mistake). It can be used after you equip the Divine Spirit, there is absolutely no require to know the skill. The Dark Lord character gains practical experience points when he equips the inventory and gains knowledge details via searching . ① https://socialfactories.com/story5198882/not-known-factual-statements-about-divine-spirit-e-dark-horse-mu-season-20