Skill: Heavy Weapons
Worn on: Both missile weapons slots and back.
The flamethrower is a heavy weapon that fires massive gouts of flame. It can be crafted via tinkering and requires oil as ammunition.
Oil can be purchased from explosives merchants (not from gun merchants) in the Six Day Stilt. Additionally, you can find oil near there in the Asphalt Mines, which is in the upper-left corner of the world map, at the very top edge, near the salt dunes. Oil is scattered around its levels in small pools of about 40-60 drams each, so make sure to have several spare containers. When you found an oil pool, press ctrl+space and then direction of the oil to pick it up without having to walk into it first.
Oil can also be collected by making a robot "bleed", although generally only in small amounts.
When utilized at close range, this weapon inflicts consistent damage and will quickly wear down most enemies. It appears to ignore AV due to dealing purely fire-based damage, and the wave of flame it projects seems to be made up of many smaller projectiles, similar to a tightly-focused shotgun blast. It occupies the back slot while wielded (because the character must wear a fuel tank to feed the weapon). Remember to reload with "R" to refill your flamethrower when you have it equipped.
The fire launched by the flamethrower expands in a cone, so be mindful of collateral damage.
Due to it being able to ignore AV and DV, wide range of fire, and essentially infinite ammunition the flamethrower currently is one of the better weapons in the game.
A guaranteed flamethrower can be found somewhere in the Tomb of the Eaters.