Board Thread:General Discussion/@comment-33053086-20171110212327/@comment-34299490-20180111151127

I believe that Salem wanted to see Tyrian because, in Vol. 5 Episode 12, it was revealed that Cinder's left arm was replaced with the arm of a Grimm. Specifically, the arm of a Nuckelavee Grimm.

Judging by this information, and that Salem mentioned how Tyrian lost his tail when asking to bring him in, I believe that Salem plans on repairing/replacing Tyrian's tail with a Grimm tail.

A Death Stalker, to be exact.