Can we get a bit more detail on the choices here.
Specifically how we would go about banishing the darkness?
Unless embracing the fire inside gave us some kind of innate knowledge, or we are able to perceive and attack the means by which the shadowspawn is generating the darkness then I can only see us dispelling it in two ways.
One is to unleash a massive amount of fire, which may burn away the darkness but would also burn our allies. Nothing I have read has led me to believe we have the fine control to release the fire without potentially damaging whoever is in range.
The other is to release a large amount of light. Which may banish the darkness but also runs the risk of blinding our allies which may leave them vulnerable to the tainted that are around. Although I would expect those tainted to be even more affected.
Is there a middle ground option that we can choose?
To embrace the fire, but hold the heat in our body, only letting the light shine out as we charge and attack the ShadowSpawn but unleashing the Fire through our attacks on it?
Intention of this is to have our focus on taking down the main ShadowSpawn, but at the same time serve as a Beacon so that we can let the others on the field know where we and the Main threat are?