Thornblade is a Mutant Florauna Hybrid and one of the Antitrix Aliens in the 2016 Ben 10 series.
Thornblade looks like a regular reboot Florauna, although a bit larger. He has two long vines coming out of his back. His main colors are darkgreen, brickred and darkyellow.
Ben 10 (2016)
Thornblade made his first appearance in the episode King of the Castle, where Kevin Levin turned into him, Undertow and Dark Matter to scare Ben Tennyson and fight against him, only to turn back to normal.
Thornblade also appears in the episode I Don't Like You, where he was seen on video footage as Kevin uploaded a video about himself.
In the episode Roundabout: Part 2, where Kevin turned into Thornblade to fight against Forever Knight, only to later be trapped in a time vortex.
In Ben 10 Versus the Universe: The Movie, Kevin turned into Thornblade to fight against and escape from Vilgax.