portal guide

1. One who is adept at traveling through portals.

2. A portal guide can be used to help you find a portal, gateway, or threshold. If you are ready to embark upon a journey beyond all that you know to be... you might need a portal guide.

Portals can have a broad range of interpretations. This is referring to portals that are otherworldly, other-dimensionally, or time portals.

"I accidentally left half my ass in another dimension, I should have hired a portal guide."