No. Dern is a "realm of influence" that tries to conquer this world. You can see it as an army. ----- The Corruption is created when the influence of Light and Darkness meet, an unstoppable and chaotic force, a good analogy is "nuclear fallout". The Nether used to be a world like ours, a battlefield of RoL and Dern, but it was overrun by the Corruption. (end of part 1)
----- Dern cannot be stronger due to Corruption's nature. As it can infect Light, it can infect Dern. Whether it happened or not we have not idea, but Dern is definitely not stronger. (end of part 2)
And to answer your unasked question, yes, Bak'al serves Dern Beast, BUT!!! Bak'al is an individual, he does not represent the Corruption. And individuals can ve weaker than other ones.
---- https://wynncraft.gamepedia.com/Corruption (end of part 3)
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