Planar Wanderer

Planar Wanderer
Feat
Prerequisite: Level 4

You can draw on the forces of the multiverse to survive cosmic extremes and to traverse its infinite realms, granting you these benefits:
- When you finish a long rest, you gain resistance to either acid, cold, or fire damage (your choice) until you finish your next long rest.
- Your experience with portals allows you to open them without a portal key. As an action, you can concentrate on a portal you're aware of that is within 5 feet of yourself and make a DC 20 Intelligence (Arcana) check. On a failed check, you take 3d8 psychic damage and can't use this benefit on that portal again until you finish a long rest. On a successful check, you can force the portal open or closed for 1 hour. For that duration, the portal doesn't respond to its portal key unless a creature employing the key succeeds on a DC 20 Intelligence (Arcana) check as an action.
- You know the direction to the last planar portal you used while you and the portal are on the same plane of existence. Moreover, as an action, you can detect the location of any portals within 30 feet of you that aren't behind 3. Once you detect a portal with this action, you can't use the action again until you finish a long rest.

Source: Sigil and the Outlands (SatO), page 11