What is called the powerhouse of a star?

Fusion

Kirby, character from Nintendo games, can usually defeat enemies by doing what? What is the full name of Albus Dumbledore’s brother? What do you call it when an athlete wins five medals in one Olympic Games? What traditionally circular Indian board game involves flicking discs called carrom men into corner pockets? Halloumi cheese, when grilled, holds its shape due to its high content of which nutrient?