Heliana's Guide to Monster Hunting, pg. 512
3rd ring Wyrd, Transmutation
You attempt to switch places with a Large or smaller target within range that you can see. The target must succeed on a Charisma saving throw or instantly teleport to your space whilst you teleport to the one it previously occupied.
A creature automatically succeeds on this saving throw if there is not enough space to accommodate either of the teleporting creatures. A willing creature may choose to fail the saving throw