Rock Kingdom: Why is black smoke coming out of my star chart?

[Fanfiction of the mobile game "Roco Kingdom"] Lin Feng, equipped with the Great Magician System, transmigrates to the Kingdom of Roco, becoming a freshman about to enroll in a magic academy. Wait, what does it mean to only use Thunderous Colorful Blue-Purple Duck Gigi? What does it mean to sacrifice low-level spirits to increase their potential? What does it mean that Duck Gigi can use Heavenly Flood and receive a 1-energy-cost bonus? Lin Feng sighed as he looked at his group of ugly but incredibly powerful spirits. "It's still too reliant on skill. Are there any simple and powerful spirits?" Facing Enzo, who failed to revive Sherry, Lin Feng mercilessly mocked him. "Enzo, do you know why you failed to revive Teacher Sherry? Because you're not strong enough." Frequent use of sacrifice magic finally attracted the attention of the Spirit King, but Lin Feng remained unfazed. "What Elf King? Even the Elf King has to take a hit from my Duck Gigi's Heavenly Flood." "Nightmare? Oh, physical damage, tens of thousands of power? What are you going to do about it?" When Nightmare finally defeated a group of elves, it was horrified to discover that it was about to face the strongest mage who was proficient in all types of magic—Lin Feng. "I never fight based on elemental advantage, I fight with saturation attacks."