I did this a while ago, but I still consider this to be one of my favorites because of how the sky came out.
Not sure how many folks in here are familiar with Kamen Rider Saber, so to put it briefly, an amnesiac novelist is recruited by an organization of elemental sword-wielding heroes who are tasked with preventing world destruction and protecting a sacred book from enemy hands.
This is the main hero’s upgraded super form: Elemental Primitive Dragon. The main hero already has fire-based powers, but this power-up grants him powers over water, lightning, earth, and air alongside his fire powers.
Unfortunately, I don’t think this MOC can be made in real life, so this may be the only way to enjoy it.