Custodian of the Planes

3rd-level College of Doors feature

You are well learned from your studies and experiences. You learn to speak, read, and write two languages of your choice.

Additionally, the following spells are added to the bard spell list for you: blink, far step^XGtE, gate, misty step, open the doors, plane shift, scatter^XGtE, and vortex warp^SCoC.

Secret Doors

3rd-level College of Doors feature

When you grant a creature one of your Bardic Inspiration dice, you can choose for an illusory door to momentarily appear within the creature's space. Before that creature moves on their next turn, they can use 5 feet of movement to travel through the door, teleporting up to 20 feet away to an unoccupied space that they can see. The door vanishes when the creature moves through it, they move without traveling through the door, or their turn ends.

Additionally, you can spend a Bardic Inspiration die as a bonus action to open such a door for yourself, which you must use before moving on your current turn.

Tunneling

6th-level College of Doors feature

By reaching through tunnels between the planes, you bring long distances closer together. The range for your bard spells increases by a number of feet equal to 5 x your level in this class. Bard spells you cast with a range of touch instead have a range out to this distance.

Hall of Many Doors

14th-level College of Doors feature

While a creature has one of your Bardic Inspiration dice, they can use a bonus action on their turn to teleport up to 20 feet to an unoccupied space that they can see by opening and walking through an illusory door. You can take the same bonus action while you have at least 1 use of your Bardic Inspiration feature remaining.