If you have not already see them, these threads may be useful to you!
RP Idea: Is this too crazy? Feedback wanted!
Question on magic in battle
Arcanist Roleplay
We know that Arcanists use geometries and other markings for their spells, so you may be able to go with something like that, but I've yet to see anything that would effectively make you dragon-like, which is what it looks like you're going for. ...there is the aevis route if your character is an Ishgardian with very "Ishgardian" blood, but I don't think people turn back once transforming.
RP Idea: Is this too crazy? Feedback wanted!
Question on magic in battle
Arcanist Roleplay
We know that Arcanists use geometries and other markings for their spells, so you may be able to go with something like that, but I've yet to see anything that would effectively make you dragon-like, which is what it looks like you're going for. ...there is the aevis route if your character is an Ishgardian with very "Ishgardian" blood, but I don't think people turn back once transforming.