Siberys Dragonmark of Passage

You have advantage on Dexterity (Acrobatics) checks. In addition, you can cast the dimension door or teleportation circle spell without expending a spell slot or requiring material components. Once you do so, you can't cast either spell in this way again until you finish a long rest. Most major House Orien enclaves have a permanent teleportation circle in place, and you may be able to learn the sigils for these circles from house authorities. Dexterity is your spellcasting ability for these spells.