The power of Grayskull gives He-Man his fantastic powers, but it also forms the basis for a spectacular, god-level attack. In 2014’s He-Man and the Masters of the Universe #15, first published by DC Comics, He-Man and his sister Adora (the future She-Ra) have infiltrated Hordak’s base of operations. When Adora tells He-Man of the atrocities Hordak has committed, he calls on the Power of Grayskull – which he then uses to unleash an attack unlike any seen before.

https://screenrant.com/he-man-power-grayskull-explained-masters-universe/