MOUNTAIN
for the abilities I like the bracket look, and I like the term marking more than runes, runes just seem overdone, as for the arm, wound't another option be hard light so in a pinch he could morph it into a blade and stab anyone or even skewer his meat onto it, I do like the space bending idea aswell, ohh if he gets advanced enough would he be able to like shape space into a bow and use hardlight/laser arrows, also cause he could bend space to give it solid form would that mean he could make it into a platform to stand on in the air, and walk in the air aswell
As for walking in the air, Each element had their own way and advantages of doing it Untill they can Fly in the air Just from their cultivation realm. earth Element will make use of gravity, Space will make use Of bending space aka teleportation, Fire will use force like jetpacks Do to explain it very simply. water will condense the water particles in the air etc. But this will also be explained in a later chapter since it is not that relevant yet, But i dont mind sharing the info since you asked. i will make a small Part the cHapter taLk about the flying stuff to give you more clarity on this đ look forWard to c16 In an hour or two! And i will use your suggestion on the Skills and markings for now until someone comments a diffirent option that gets more likes. I will leave previous chapters as they are