Undead Mage with No Skill Cooldown

In this world, everyone can awaken a random profession and the higher spiritual power one has, the more likely one will unlock a rare profession. With 130 spiritual power, Lu Ran was supposed to unlock an SSS profession yet his profession turns out to be a common Undead Mage. Just as he feels doomed, he discovers his unique ability:
[Entry: Celestial Master's Borrowing Skill]
[Effect: No cooldown on all skills]