>>282885532
>You'd have to do the same with fire or acid.
Do you think Genthru blew himself up every day for a year to make Little flower? Do you think Meruem did anything more than intellectually understand what a Photon was? Bungee Gun straight up doesn't exist outside of a in-universe candy.

Transmutation and Conjuration operate on image training. This can be achieved by subjecting yourself to a stimulus but imagination and technical understanding work too. For Acid, you could simply study other acids and then imagine a new type. For Fire just be an arsonist.