Naturalized Denizen
( Unearthed Arcana, p. 94)[Spelltouched]
You are unusually anchored to your location.
Prerequisite
Exposure to dimensional anchor spell,
Benefit
You are never treated as an extraplanar creature (and you lose the extraplanar subtype). Thus, you can't be affected by a banishment or dismissal spell or similar effects that send extraplanar creatures back to their home planes.