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1-Emberkind Bug is a Fire-type spirit known across the player community as the strongest single-spirit pick for early to mid-game boss content in Roco Kingdom: World. Its trait, Cinder Grass, inverts the normal behavior of the Burn status: while Emberkind Bug is on the field, all Burn decay becomes Burn growth, so stacks accumulate over time instead of fading. Combined with a four-skill kit that lays Burn pressure, locks in defense, and converts accumulated stacks into burst damage, Emberkind Bug carries beginners through bosses that would otherwise require coordinated team play.
1+Emberkind Bug (燃薪虫) is a Fire and Grass dual-type spirit known across the player community as the strongest single-spirit pick for early to mid-game boss content in Roco Kingdom: World. Its trait, Cinder Grass, inverts the normal behavior of the Burn status: while Emberkind Bug is on the field, all Burn decay becomes Burn growth, so stacks accumulate over time instead of fading. Combined with a four-skill kit that lays Burn pressure, locks in defense, and converts accumulated stacks into burst damage, Emberkind Bug carries beginners through bosses that would otherwise require coordinated team play.
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33 Type and Role
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5-Element: FireCombat role: Damage-over-time boss carry, stacking Burn into burstBosses it handles: Almost every non-Fire-type boss available at launchHard counter: Fire-type bosses, due to the type matchup blocking Fire damage and Burn pressure
5+Element: Fire / GrassCombat role: Damage-over-time boss carry, stacking Burn into burstBosses it handles: Almost every non-Fire-type boss available at launchHard counter: Fire-type bosses, due to the type matchup blocking Fire damage and Burn pressure
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7+FieldValueChinese name燃薪虫Dex number326ElementFire / GrassStage2, final form of the Ash Debris Worm lineTotal race value579
8+Base stats are HP 135, Physical Attack 120, Magic Attack 48, Physical Defense 103, Magic Defense 73, Speed 100. It evolves from Ash Debris Worm (柴渣虫, NO.325), which shares the same Fire and Grass typing and totals 462.
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710 Cinder Grass Trait
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912 Burn normally ticks for damage and then loses one stack at the end of the turn. Cinder Grass replaces that decay with growth: every turn the Burn would tick down, it ticks up instead. The longer the fight runs, the more pressure the opponent absorbs. Boss encounters with high HP pools become the trait's ideal use case, since the trait's value compounds with every additional turn.
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1114 Core Skills
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1316 SkillEffectIgniteApplies 10 stacks of Burn to the target on castFlame ShieldReduces incoming damage by 70% on the next hit and adds 6 Burn stacks when struckScorching WaveDeals Fire damage and adds 4 Burn stacksComplete CombustionDoubles the target's current Burn stacks and detonates them for burst damage
1417 Beginner Boss Rotation
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1619 The five-step pattern below clears most early-game bosses without team coordination:
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1821 Open with Ignite. Establishes the initial Burn stack pool that Cinder Grass keeps growing.Use Flame Shield reactively. Trade incoming hits for damage reduction and additional Burn stacks.Maintain pressure with Scorching Wave. Keeps stacks ticking up while pushing direct Fire damage.Detonate with Complete Combustion when stacks are high. Doubling a large Burn pool produces a single huge burst.Repeat the pattern. After detonation, lay another Ignite and rebuild stacks. Cinder Grass keeps the new pool from decaying.
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2023 Why it Works for Beginners
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2225 New players often lose boss fights for one of two reasons: low burst ceiling or no sustained pressure. Emberkind Bug solves both with a single spirit. Its 70% damage reduction on Flame Shield turns hits into Burn fuel rather than damage taken, and Cinder Grass means even a slow rotation produces escalating damage. There is no need for Spirit Cultivation investment to make the kit work, although increasing Magic Attack speeds up burst phases.
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2427 Tips
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2629 Save Complete Combustion until at least 20 to 25 Burn stacks are on the target, otherwise the doubling is wasted on a small pool.Bring an Advanced Gulu Ball or higher when first capturing Emberkind Bug. The capture is worth retrying with premium balls because of the spirit's payoff.Do not engage Fire-type bosses with Emberkind Bug as the lead. Swap to a Water or Earth attacker for those matchups.Pair with healers like Meow or Dandelion for boss fights that exceed the rotation length.
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2831 See Also
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3033 Combat System - turn structure, status effects, and burst mechanicsElement Types - Fire matchup chartTips and Tricks - general progression advice