Claw Mark

Code has the unique ability to mix chakra with the iron from his blood to create portals to travel to previously marked locations.

Overview
Once applied to a surface, Code is able to freely travel to any of them, regardless of distance — even if they're in a different dimension. While it only allows him to move through them, he can take one other person with him at a time. Despite this, Amado doesn't consider this ability to be space–time ninjutsu. While mostly used in battle or for transportation, Code also employs them as a means of communication, putting his mouth or ear through them to contact Ada.

Although primarily chakra-based, they also contain iron from Code's blood which when mixed together causes them to become physical matter making absorption impossible, as demonstrated when Boruto Uzumaki attempted to do this using his Kāma.