Chestpiece could drop as journeyman but the chance is very very low.
The boss is easy because its attacks are very weak, pay attention though to his fire-breath, it will always push you in the lava, and that is what makes this boss a pain in the ass. Small tiny platforms, the f.... lava (instant death), no platform with a wall without lava behind you. The platform where the fight starts is the biggest, so stay there, don‘t hop around, the chance of falling into the lava is very high.
If he‘s flying towards you, he always comes with a fire-breath. The Tek-Rifle will push him back, so that his breath couldn‘t reach you. If he‘s flying around you, attack with the best weapon you have (don‘t get nervous and don‘t run around, stay calm in the middle of the platform and attack).
After some time he flies back to the volcano, and prepares the next fire-breath. Pay attention, dodge it, or shoot with the Tek-Rifle and so on.
Using a shield or crouching down doesn‘t work against his breath.
