To be able to do finish the game we need to craft the Dream Vision Pendulum, but to craft it, we need to craft other items as well.
One of those items is the Alles Welt, but to unlock its Recipe we need to Synthesize an Asterisima as a condition to unlock its recipe but to Synthesize the Asterisima we need Seele Pilos (one of the materials).
This material is a drop type only, you cannot gather it sadly but only get it as a drop. The monster that drops it is the Abyss Tyrant which is found in Surva’s Heart in Deep Cavern.
Unfortunately, he cannot be found normally as other normal Giant Monsters, we need to get its Quest from Crystal Sparkle Pavillion. The quest is random though so you need to finish other requests until you get the Abyss Tyrant Hunt request.
When you do get his Hunt Request, then please save the game before you try to hunt him. If you don’t get the Seele Pilos then reload and hunt him again until you get the Seele Pilos.
You only need one 1 Synthesize the Asterisima, after doing that you will unlock the Alles Welt recipe if you completed the second condition as well ( Synthesize 4 items).
Once the Alles Welt is done and you have the rest of the items which can be unlocked far earlier in the game and i suppose you already have them (Vision Way Finder, Alles Welt, Innocent Adamas, & Rainbow Nuetralizer).
Now synthesize the Dream Vision Pendulum and finish the game
