Re-Awakening with the Summoner's Class - Chapter 7: Boss battle

In a world where all magical spells have been captured into cards, those who can build a deck have the most power.The most Arthur could ever hope for was to someday earn a trash-tier spell card. When fate grants him a legendary Master of Skills card, he's thrust into a world of opportunity and danger.To survive and grow strong, Arthur must learn skills. All the skills.

When the night came, there was a twittering sound in his ears, and the monster in the shadows began to move restlessly. Jason’s hungry stomach began to roar, and he couldn’t help swallow his saliva. Hunger was the best spur.

A slime randomly falls into existence. Sapient and born with the ability to recreate parts of the things it preys upon, the highly confused drop of primordial soup decides that the only real thing it can do is become the being at the top of the food chain. A task of longevity in the leaves of the Omniverse.

I became a mage character from my favorite game.