"Fiery Weapons:" an addition for Willow's rebalance (no pyro)

this idea started in conversation with @Pop Guy about Willow's rebalance ideas:

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Pop Guy's initial idea:

But if, finally, Willow could even build "fiery" versions of the basic weapons?
Nothing particularly convoluted or complex: it would be enough to add a single tab for her, the "toys" tab. Here, combining each basic weapon of the game with a red gem can create an identical variant but with a reddish iridescence, with the same BUT features that inflict fire on enemies.

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This is an awesome concept. I would add a "charge" mechanic to the fiery weapons so Willow and other players have a visual reference. She could even have some lines of text related to that.

The warmer the weapon gets the more dmg it deals but also the higher the risk to hurting Herself with fire.

That would be cool cuz she is not gonna affect other stuff around her. It would be more like an insane burning wave causing hp dmg to her only or the person using the weapon. 

Her fiery weapons overheat the person using it but then Willow should have overheat immunity anyways, which by default makes her the best character to use the fiery weapons the first place. 

The weapons will cool down if not used and the charging effect could start again. That could make a great tactical advantage to switch between different weapons to utilize the charge strategically or simply take the hp heat dmg and heal it up. 

Her fiery weapons could even be fireproof in spring... Something we already see in SW and obsidian weapons and a great feature for Willow to be the master assassin in that season. 

The "fiery weapons" could be a really cool addition that doesn't necessarily are related to the "pyro" concept.. but they are closely related to HEAT WEAVES.

soo what do you think?