Thornblade is a Mutant Florauna Hybrid and one of the Antitrix aliens. He is the counterpart of Wildvine in the 2016 Ben 10 series.
Thornblade looks like a larger version of a Florauna from the 2016 series. he also has two spiked vines on 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 turn into him to scare Ben Tennyson. He later turned into Undertow and Dark Matter, only to turn back into Kevin a bit later.
Thornblade also appeared in the episode I Don't Like You, where Kevin turned into him, showing off his abilities on the internet.
In the episode Roundabout: Part 2, Kevin turned into Thornblade to fight against Forever Knight, only to later be stuck in a time loop.
Thornblade also appeared in Ben 10 Versus the Universe: The Movie, where Kevin turned into him to fight against and possibly escape from Vilgax.
Thornblade appears in the video game Ben 10: Power Trip, acting as a counterpart to Shock Rock to help Ben fight against Hex and Lord Decibel.