>>23383958
The latest teaser seemingly implies he was expiremented on by the Muters and Caries is trying to get him back. On that same forest we see Caries holding Taorin's Gavv with some skin attached to it seemingly after he kills him and we also see Caries upgrading doing some sort of cast-off.
He's seemingly is going to lead to the upgrades for both Shouma and Caries.