This spell is a part of the Transference spell chain and found in the Transference rune stone.
The mind does not always distinguish between what is real and what is believed to be real. Dream understands this perfectly. It has always known that reality, at its edges, is more negotiable than most people are comfortable admitting. A thing believed in completely enough begins to behave as though it exists. And a thing that behaves as though it exists - that pushes back when pushed, that refuses to be passed through, that stands where it was placed without wavering is, for all meaningful purposes, real.
Barrier is Dream's most straightforward expression of this principle. The mentimancer constructs a wall in their mind - smooth, solid, immovable - and holds it with complete conviction. There is nothing there. And yet whatever comes into contact with it finds itself stopped, pushed back with exactly the force it brought to bear, unable to pass or climb. The barrier does not need to be made of anything. It only needs to be believed in. And the mentimancer believes in it completely. What the mind insists is real, becomes real. That is the quiet, extraordinary power at the heart of Dream.
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