The Trefoil Barrier

"Not to be confused with Trefoilverse."The Trefoil Barrier is a barrier shaped like a trefoil knot. It contains all objects in the Knot Chain, and its edge is made out of many of the surfaces of Hencentroverses.

The Trefoil Barrier was originally named as a joke that it was relatively easy to escape, but later it became what was used as the name and eventually became it's official name.

Edge
The edge of The Trefoil Barrier, as I said, is made out of surfaces of Hencentroverses. Note that these are not Hencentroverses, just the surface of them. Because of this, the Trefoil Barrier is pretty easy to get through.