Diesel: Winter SweetsLimited

A Fire Burst 3 DPS whose ceiling soars against Wind bosses with many parts.
Her Damage Taken increase debuff boosts squad firepower, but outside Solo Raid her versatility is narrow, so her value rises in content where the conditions fit.

Skill 1 creates an Intro or Climax state on Full Burst entry, and the strength of her sustained damage buff varies by state. Skill 2 builds a sustained damage buff triggered by Full Charge attacks and part destruction, and on Full Burst entry deals extra sustained damage to the stage target. Her Burst applies a Damage Taken increase and sustained damage to all enemies, with larger sustained damage on the stage target.

Auto play works by default. Bursts cycle every 20 seconds and Diesel's Burst 3 is 40 seconds, so when running two Burst 3 units, placing Diesel further to the right keeps her Burst from being picked automatically in the first Full Burst. This placement reduces first-cycle loss, and you only need to adjust manually when timing part destruction to handle Noise Pollution.

Increased Reload Speed keeps Skill 2 stacks stable. If you own high-level Harmony Cubes, using the higher-level one first is fine.

Set Elemental Advantage damage and ATK first, then pick leftover lines from Critical Rate, Critical Damage, and Max Ammunition Capacity based on your gear.

S2 contributes the most scaling, so raise it first, then raise the Burst to boost both the debuff and accumulated firepower. Reinforce S1 last.

Against Wind bosses with many parts, she has high value as a core pick in Solo Raid. Her priority is low in stage progression and Arena.

In boss fights with many parts her ceiling is high, and her Burst's Damage Taken increase also raises damage for the whole squad.

She depends heavily on conditions like parts and battle duration, so her versatility is narrow. If her reload and Full Charge tempo break, her damage drops sharply, and she is inefficient in Arena.