One Does Torpor Damage (Wyvern), though the Wyvern has a Hit Box issue currently but overall it works just like the Dragon except slower movement. I currently can not adjust the speed on the Wyvern but this Bionic doesnt reallly need it. If you build the Dragon keep in mind there are 2 types; Flying and Non-Flying. I would pick Flying.

I'd go wyvern... Not bad of hit box issue will get fixed, it's only because I sized it down and I will speed up the wyvern turning and allowing level ups there.

Definitely The Wyvern. It can Also Go invisible! I have a Video Showcasing it here if you would like to watch:

https://youtu.be/_msajCmAsH0