I've explained this before, but Wormwood takes Eggyhead's max power, which is roughly planetary strength and durability, with him reaching speeds faster than light.
Every moment, which can be anywhere from a couple seconds to a fraction of one depending on how angry Wormwood is, Wormwood's power increases tenfold. One second he's shattering planets, the next he's exploding stars, after that galaxies are jumbled by the force. Eventually he'll get so strong that dimensions fall apart when he throws blows.