A classic case of interdimensional travel

Bob was on a ski trip in the mountains. However, after getting caught up in an avalanche, he wakes up underground cave. He soon realises that he did not die and is still on Earth. The only issue? A talking magical cat has decided to bring him along to save the multiverse. Being forced to come along despite barely receiving any explanation as to what is going on, Bob figures out how to use magic and attempts to survive while discovering the truth behind all the nonsense that keeps happening. "Before you get ahead of yourself, you are not a chosen one or anything. You are just some guy I decided to bring along. That is all there is to it. Totally." Be warned this book is stupid.