Infinite healing? I've become an immortal poison healer!

Ning Chuan transmigrated. He arrived in a world filled with magic and monsters. Raging demonic wolves breathed fire, destroying towns. Dragons in the far north froze thousands of miles with a single breath. Undying ghosts roamed freely, and frenzied undead slaughtered with bloodlust. At the graduation ceremony, Ning Chuan, who had awakened as a D-rank priest, was ridiculed by everyone, but he didn't care. Because on his class panel, there was a Supreme Blessing: [Supreme Blessing: Eternal Buff]. While others were still in multiplayer teams, painstakingly exploring and slowly leveling up, Ning Chuan had already become an immortal healer with infinite mana and endless health thanks to the timeless buff. An amazing scene then unfolded! A priest, wielding a cross-shaped longsword, engaged in direct melee combat amidst endless undead monsters, relentlessly fighting and wearing down all the enemies. "Any stronger attack power? Are you just tickling me? The damage you do in one second isn't even as much as the health I recover in one second!" Ning Chuan said. I am impervious to countless attacks, I am immortal and indestructible, I am the only one who reigns supreme!