Killing Monsters Increases My Spell Count, All My Skills are Forbidden Spells

Qin Sheng traveled to a world where everyone changed their profession and awakened as an ordinary professional mage. The most useless profession in the early stage? But Qin Sheng awakened a god-level talent - multi-layer casting. Killing monsters increases the number of spell layers! So Qin Sheng embarked on an invincible road, killing monsters to increase the number of spellcasting layers. Low damage? I raised my hand and cast a fireball spell, 100 million fireballs. Low defense? I cast a shield spell, hundreds of millions of shields, and the value is longer than my health bar! Low health? One of my healing spells triggers hundreds of millions of effects, instantly filling up your health bar! Low on mana? My passive recovery restores more mana than it consumes! … As Qin Sheng went further and further on this road of invincibility, he gradually unlocked more skill effects. A few years later, The abyss demon invades the blue planet, and everyone faces the crisis of world destruction. Qin Sheng alone stands before all the others. Countless skills that were like forbidden spells of world destruction gathered and condensed in his hands. "Don't be nervous, it's just a piece of cake."