The Sage of Six Paths traveled to a land called Redaku in search for finding a cure for his chakra illness. A meteorite struck the earth and hagoromo split it in half, he was showered with silver particles that not only instantly cured his illness but amplified and doubled his strength. His chakra also expanded to a higher limit. These particles were named Ultra Particles. Naruto suffered from the same illness and sought answers, he managed to receive half of these particles which cured his illness but didn’t give him a chakra boost like hagoromo. The Sage wanted to stop those who would come after this grand power and hid Both half’s of these ultra particles in a metaphorical way, he placed one half in "the sky that fell to the earth," and the other half in "the star that never strays." On top of already being the 10 Tails Jinchuriki, Hagoromo got a chakra amp that doubled his chakra volume. Hagoromo in his Prime is more powerful than we could’ve ever imagined because of these Polar Particles.