The Rock dimension was made of nothing but rock, which Kyon immediately blew up. The dimensional collapse made tiny flaming demons shaped like piranhas.
They shot acid rhinos and frozen houses out of their teeth at an alarming rate. Kyon simply walked towards the piranhas slowly just brushing away the frozen houses.

Kyon punched the acid rhinos in the face causing the acid to launch away at the other dimensions. They melted causing them to turn into interdimensional goo. The goo hardened over the piranhas turning them into BOMBOPOTAMUSES. They were all set to explode on top of Kyon, but instead of fighting them,
Kyon let them blow up.

The explosions sent shock waves all over the multiverse, causing new dimensions. With the BOMBOPOTAMUSES gone, Kyon flew into the next dimension.