Magic Rider Level 17
Your people used powerful magic to travel between distant worlds, and the remnants of that magic make such transportation easier for you. When you are the target of a Teleportation spell that transports more than one person, it can affect an additional person beyond the normal limit, chosen by the caster. Additionally, when you're the target of a teleport spell, you and the other targets arrive no farther than 1 mile off target, regardless of distance traveled.
Source: Advanced Player's Guide pg. 43