“If you want to wield Fyr'alath safely, you'll need to modify the weapon's haft with three components.
First, you'll need a fireproof hide that can handle intense heat. Next, acquire enchanted vellum that can contain the weapon's volatile magic. Finally, a scribe must apply the proper runes, so you can bind the first two materials to the axe.
My journal over there includes a few recommendations of crafters who can help you. You might also know a few!”