My theory
Feel like I AM STRETCHING THIS but this is what I think,
I still can’t get a clue about the Triasta but if you spaced the word Tri and Asta, all we get is
Tri means Three
Asta means Divine Strength
Tri can basically mean he’s using some sort of Trident because it has 3 pronged blades.
Asta could POSSIBLY (BIG IF) mean he uses Aether.
Honestly, I don’t even know if this is correct.






