Just maintain the current slotted passive of increasing weapon damage of ardent flame abilities. Let it deal poison damage and scale to stamina. That's all there is to it really.
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Much of a spammable ability strenght comes from passives. Take Jabs as an example.
The skill alone isn't what makes it a great ability. It's Spear Wall and Burning Light that improve it massively and make it one of the best spammables in the game.
Warmth, World in Ruin and Combustion aren't passives that make a spammable strong. The result would be a cheap skill that hits like a wet noodle, slows and sometimes restores resources. Basically, Venomous Claws 2.0