Skills Without Cooldown? I Avatar into an Undead Calamity!

After awakening in a world overrun by monsters, he obtains an extraordinary cheat ability: No Cooldown. With the power to use his skills without any waiting time, he quickly becomes an unstoppable force. As his abilities evolve beyond human limits, he embarks on a path that will transform him into an Undead Calamity capable of bringing destruction to the entire world.