It cannot be.
This is impossible.
I.... I am failing.
It was working. I could tell. Leading the sickness on a chase, farther away from the World so that it would not be damaged as we fought, chipping away at it bit by bit with the smaller wraths, and trying to think of a better plan to finish it. But the plan failed as scything rays of something alien, something writhing with the corruption and darkness struck me repeatedly, launching me through space.
I felt it then, something I had not felt physically since childhood. I felt pain.
Where the concentrated beams of Pestilence had struck me my skin burned with an agonizing fire that I could only extinguish by shedding the outermost layer of my form. Something that happened almost instinctively as I struggled to reorient myself but failed as the sickness turned my own trick against me, firing the fragments of dead Worlds to strike me and force me back.
Again I try to recover but cannot as the rays of darkness strike me, burning and throwing me once more. But there is some relief. I enter another World now and feel a surge of renewed confidence. If this Pestilence's domain is the place between Worlds, this is mine. I begin to call to this World but am interrupted as the Pestilence follows me, vast tendrils of corrupted darkness flowing down into the atmosphere. And the voice keeps resonating in my mind pressing against my will.
"You are no salvation. You bring torment, sickness, death." I fire back, but in truth there is a place in the deepest recesses of my mind that the words speak to. Were there not moments when I pledged to give the World the final mercy should it be too far gone? Could this Pestilence be the sign?
No! I scream at my own rebellious mind. It is not too late. But as my own mind rebels I can barely avoid the Pestilence as it continues to attack me endlessly, pressuring me and forcing me deeper into the atmosphere. I call upon this World to shield me but it eats through the shields and is about to engulf me again.
Then in the darkness of the situation I see a light. I have grown so used to this form that I almost forgot. But I can shape myself and there is something else. Something else lurking in the bowels of my thoughts, a half remembered state that calls to me now. There is only time for one change and I choose now to trust myself.
I let myself change then and it feels so natural. I erupt, concentrated red light flowing from where my angelic form once hovered and spreading across this World. In fractions of a second my awareness expands. I can feel it all, the Worlds around me, the Pestilence that has come for them, the universe itself. I see new threads hidden to me, threads that run through even the void.
A new thought bubbles up within my mind, a new word, a new drive to join healing.
"CREATION" I would blink had I eyes as my thought resounds like thunder through space and my will surges again.
Instinctively I reach out and this World of gas and storms turns against the intruder. I gift the winds with unstable matter, arcs of pure annihilation streaming through the darkness as the entirety of the atmosphere turns against it in an instant of effortless control. I drive the Pestilence back forcing it out of the atmosphere, forcing it back into the void of space above.
And then I rise. Red light streams in a cloud of wisps and swirling radiance as I return to the void as well.
"I am Mercy."
"I am Creation."
"And these Worlds are mine!"
Mercy evolved. :D