90% sure in what messed up JDs arm. Potential Spoiler

In all I the JD monster branding he has tentacles wrapping around him. I belive JD is infected with a parasite from the swarm (pouncer) and it also affects him mentally too. We will see this attack on JD at the end of Act 1 most likely.

Makes sense since his arm is reddish.
Reading the book and he’s still same old JD.

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