Scavenger

"The Scavenger is a battlefield scrapper and combustion engineer who collects junk, metal, and wood from the environment to power flaming weaponry and magically-augmented implants. The class specializes in adapting to surroundings, using scavenged material as fuel to ignite flame-based combat modes, unlocking powerful, temporary fire attacks based on junk quality. The better the salvage, the more dangerous the arsenal."

As a Scavenger, you must scour the battlefield for junk and trash to use as fuel. With an arm implant, you break down the junk to use as fuel for a chainsaw sword that ignites in flames. Scavenging can be done with bonus turns, while the abilities they unlock can be used with regular turns. Without scavenging, you may still attack, but your sword's chainsaw does not operate, nor does it's flames, making your attack weak.

Tier 1 Junk is anything that is trash, broken materials, sticks, ashes, etc, and unlocks one usable fire attack during your turn.

Tier 2 Junk, anything that is Tools, weapons, whole materials, unlock two fire attacks.

Tier 3 junk, armor, gold, machinery, unlocks three fire attacks.

Abilities:

Ignition Burst – You use a bonus action to grind junk with your arm implant to use as fuel for your sword this turn. You may unlock a second use of this action randomly per junk burned.

Flame Slash – During Ignition Burst, you add fire to your sword attack.

Cinder Stomp – During Ignition Burst, you slam your sword into the ground, creating a forwards cone of fire.

Furnace Drive – During Ignition Burst, you jump to a chosen place, creating a shockwave of fire upon landing.

Thermal Core Rush – During Ignition Burst, you dash forward in a stream of fire, knocking back and burning enemies.

Salvage Efficiency (Reaction) - When you kill an enemy, you may choose to burn one of their items, armor weapons, etc, to unlock two to three stacks of Ignition Burst next turn.

Fieldcraft Salvager (Passive) - You may store up to three pieces of junk per long rest that you build in camp, allowing you to burn them for health during battle.

Ultimate Ability – Scrapfire Overload – You suck in all junk on the battlefield, unlocking a state of constant burning and unlocking all fire abilities every turn for an amount of turns based on how much junk was burned.