Board Thread:General Discussion/@comment-33053086-20171110212327/@comment-27143816-20180204043130

ChishioKunrin wrote: Watts was assigned to give Tyrian a new tail, and Cinder told Watts "Go home and play with your machines". Watts deals with mechanical stuff, not biological. Tyrian's tail will most likely be a mechanical prosthetic like Yang's arm.

Actually, after Raven calls refers to him as a disgraced Atlesian Scientist, watts specifically calls himself a Doctor. He very well could have been specifying that he is a medical doctor (as the term scientist would already imply that he has a PhD, likely in engineering). Plus if Salem need him to get Tyrian a tail, he still needs some biological knowledge to ensure that the new tail, if it is mechanical, is attatched correctly.

Also "machines" is such a vague term that it could refer to any sort of technology. From robotics/robotic weaponry and prosthetics, to medical devices and genetic engineering technology.

In addition, Grimm aren't exactly biological in nature, but more of a mystic force of destruction and chaos. SInce Watts is the servant of Salem, the Mistress of all the Grimm, than a Grimm prothetic is very possible for the following reasons:

1) Grimm would be a readily available resource to Watts, considering he lives right outside a Grimm spawning ground.

2) Salem could provide all of the information for Watts to perform such a procedure, create the specific Grimm required or modify an existing Grimm, and give Watts command over the Grimm to perform to operation.

3) He's already done it (maybe). Watts, as a doctor and given the previous 2 points, could have grafted a Geist arm onto the injured Cinder (the only alternatives to this hypothesis would be that the Grimm Beatle from the glove grew a Grimm arm for Cinder or that Salem magiced Cinder an arm).

Finally, in my opinion, a Grimm tail would be a lot more interesting than another prosthetic. Anyone in Remnant can presumably have robotic prosthetics, and we've seen the capabilities of robotic prosthetics and robotics in Remnant before. However, we've barely seen any Grimm prosthetics and we have a prime opportunity to provide a character with a unique replacement for one of their body parts that no one else in Remnant could get, as opposed to robotics, which anyone can get.