I'm a Mage, What's Wrong with a Trillion Health Points?

Jiang Mu and humanity were defeated in the battle of civilization and died in an assassin attack, but unexpectedly reborn and returned to the day before the server was launched. Entering the game, Jiang Mu directly obtained the only SSS-level hidden profession, Blood Lord! Blood Lord's Arrogance·Legend: The blood volume is increased by 100%, and all magic attacks are accompanied by 20% of magic blood drain. Blood Draining·Legend Level 1: After releasing the skill, a territory is established around the body, and every 1 second, it will cause 10 + health x 10% magic damage to an enemy in the territory. Mana consumption per second: 5. After the skill is upgraded, the number of enemies attacked, damage increased, and mana consumption per second increased. The thicker the blood volume, the higher the damage! It's meaty and high in damage! The world's number one assassin: "You may not believe it, but if I hit him with 800 million blood, his health bar wouldn't even be affected!" The world's best shield fighter: "Compared to him, I'm just a squishie, but he is the bloody cow!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.