Edelgard
She didn't miss a beat. Did this thing think she needed to be coddled?
"Irrelevant," she answered. Her feet were planted firmly on the ground, her legs strained in preparation, pulled taut like rope. In a few seconds, her boost would go out. Instead, she let herself loose, and shut the distance in a flash, stopping but scant meters away.
Narrowing her gaze, she raised the tip of her polearm at the giant. "Leave, or tell me. Where is the cause of this madness?"
The children of the night
The beast closed its star-like eyes and sighed. "Nay, none of us four have such power, at least on this scale. This wonderful view is nothing more than the will of our lord and progenitor, and the wish of this world."
A slimy, grotesquely long appendage that would logically be its arm stretched and waved towards the astray citizens, living and dead, who were afflicted by the corruption and slowly mutated. Some faster than others, others already lost. On a closer look, his bulbous mass's mouth had many canals coursing inside, each a different mouth within his large maw, all connected to his stomach. The putrid breath was vile to even think about.
Reaching for a stray mindless organism, it caressed its face which responded with a soft wail. Before it could grow any more attached to the carress, the vile hand clasped at its head like a vice and squeezed with a crushing grip, spewing pus, flesh, grime and the same strange black ooze like a crushed tomato.
"Poor things... Even now, they are changing in accordance to its will. If you wish to stop this, I will not judge you. But making the world itself your enemy when you lack the strength to do anything... such ignorance. It is foolish to the point of being adorable."