Scenario 1: (This is assuming we've been fighting off screen).

Despite the fighting seemly going on for days, Burning Desire doesn't seem all that tired. The only sign of change is the now blue and black flames that radiate off of him in addition to the standard bright orange.
BURN!
With both hands, two Soulburner Column are directed towards LLM while a noticeably large flare flies off of BD's body towards G(if still in the fight).
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Soulburner Column
A large beam of flame is fired at the enemy. Unlike the regular variant, this one seems to be mixed with an unknown flame compound.
Unnamed in Battle:Renegade Flare
A flare, varying in size, flies off of the user's body towards a target. It seems to have a mind of its own.

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Scenario Two: No Time has passed

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Letting out a mix of a laugh and a scream, a massive aura of flame rapidly expels from Burning Desire's body towards the two. Following it is a black aura that seems to penetrate defenses.

(Hate to stop/negate moves but...)
As you try to grab at his arms, they dissipate in your hands. Their hot touch seems to bypass your skin. Unaffected, two new arms reappear as Burning Desire screams:
BURN!
Exhaling, a massive explosion surrounds both Burning Desire and LLM. As this point, it becomes clear that something's off from your last encounter as instead of simply brushing it off like nothing, its raw power is enough to send you flying back(should it hit/not be defended/etc).

From the warp comes a snowstorm...?

(My boy ain't got no liver. Also, you can call it magic if you want. It's not just meant to be any ol regular fire though, trust me.)
As a portion of BD disappears, Burning Desire takes a deep breath, seemly calm for the first time in ever despite the situation of what's to come.

Suddenly, the cyclone which hasn't been tampered with thus far closes in upon itself, plunging the balls into Mario. They seem to have been imbued with a certain kind of flame, which is evident by the fact that it still appears to do some sort of damage to him.
Does he hope to challenge a lion to a game of chess and expect it to play?
Above Burning Desire's head a warp appears. Not even giving it a passing glance, he lazily rotates his wrists, churning out a few Fireballs.

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(Just gonna say this for the record, the flames aren't acid, just reacting like it in that one instance. Don't want to give the wrong impression)

...
Brace for impact.
The hammers go clean through Burning Desire, exploding him. Thousands of cinders cling onto the hammers and like acid slowly dissolve whatever they touch. These don't seem like regular flames...
So that's...Mario? Don't remember him being this...different.
Liquid pours from the point of impact, quickly expanding back into Burning Desire. Meanwhile, the Cindering Cyclone encloses LLM.

...
BURN Round two pal.
With no fanfare, Burning Desire fired a Cindering Cyclone at LLM as well as a haymaker!

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Cindering Cyclone When used, a firey tornado erupts from the user's body towards its target. Should said target be trapped into the tornado, the temperature will increase.

BURN!
Faster than the words can even reach you, Burning Desire barreling into you with the force of an asteroid, singing your back in the process.

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A small spark off of a car battery lands near a stack of papers. In an instant, the papers catch aflame.