Despite Neftin's size, he is pretty quick and can put quite the hurting on you due to his speed. He wields two electrified chained balls which he can extend. Initially, he'll use attacks such as overhead swings with both weapons, then jump into melee range, where he'll proceed to swing at you with one of the spiked balls.
Once you do enough damage (or enough time passes), he'll jump back and send out both of his weapons to his sides. He'll then proceed to send out electric shockwaves, which is easily avoidable by jumping over them. When he's done with that, he'll hang slightly above the arena and then send his other ball at you, which will send out an electric shockwave as soon as it hits the ground.
Neftin will go through these attacks until you get his health to about 50%, where he will swing out of the arena. Now, trains will pass through and drop off enemies (all melee Thugs), so you'll want to get rid of them all as they come. There will be a total of five waves before Neftin returns to the battle, along with two Jetpack Thugs.
Take care of the remaining Thugs while keeping an eye on Neftin, who will go back to attacking you like before. Blast away at Neftin, noting that the Jetpack Thugs will likely return at some point, so take them out before concentrating on Neftin again. Once you finally down Neftin, watch the cutscene that follows as all hell breaks loose now.
You now have to escape the planet, which is populated with Nether creatures. That means you have to be careful and plan your shots, as they are known to teleport a lot before trying to attack you. There are two Nethers in the first area, then a large area with the Jetpack and one more Nether. Keep going until you encounter a larger Nether, whose only attack is to send a strong blast at the ground at your position (jump to avoid it). Kill this one off to initiate another scene, with your next destination being Planet Thram.
