10 minute cooldown (must be Google Lens translator mistake). It can be used any time you equip the Divine Spirit, there is absolutely no need to know the skill. The Dark Lord character gains practical experience details when he equips the inventory and gains expertise factors as a result https://getsocialnetwork.com/story5218523/new-step-by-step-map-for-divine-spirit-e-dark-horse-mu-season-20