10 minute cooldown (must be Google Lens translator mistake). It can be used any time you equip the Divine Spirit, there's no need to discover the skill. The Dark Lord character gains practical experience points when he equips the inventory and gains practical experience details via searching . ① https://socialbuzzmaster.com/story5329234/5-tips-about-divine-spirit-e-dark-horse-mu-season-20-you-can-use-today