They're chaotic dead

So you completed the thorn, lumina and last word questlines yeah? [spoiler]Shin Malphur is Dredgen Vale, he believes in what Dredgen Yor did after years of thinking it over. Yor became the bogey man that was necessary to spark a change so too do the Dredgens. Shin is merely a persona Vale uses to kill off the one's who go too far off the deep end, and Calum and he setup that whole scenario where he supposedly "killed" Calum[/spoiler]

Yes, but it's revealed that after this Shin brings all the non founding members of the shadows together and kills em all in one go. Thus exterminating the dredgens and any semblance of what we once believed them to be. They're basically gone now, they're extinct save for the founding members who weren't evil in the first place Also Shin is not a persona for Vale, Vale is a persona for Shin