in fact, all you have to do is get a dragon boss, a lamb and a cat robot 1)the dragon boss can be won if you approach the black biome there is a hole there stop there and then it is clear you need to break the stones and then go back and win
2) at the expense of the lamb, it is difficult to say where it is, personally, I found it in the snow biome, storm it, be careful when you drill you will see something like a coffin, you need to break it and that's it
3) robot cat you have to find her drawing. Personally, I found the drawing while walking in the snow biome from above, after which it only needs to be assembled