The Foundation Of Everything is all of the laws in physics that ever existed. The laws are called the foundations and they are branches on the tree of the foundation of everything. Everything larger than this probably just has more laws. The laws won’t end!
What about... the trunk?[]
The trunk of the tree makes the laws in order and not in Chaos. It is the most important part of the tree and the largest. It isn’t made out of any element. In fact, the whole tree isn’t made out of any element, because it’s just laws.