Roaring Fur-nace

Max-level stats (Lv60)

ATK (Lv.60)

713

ATK% (Lv.60)

30%

Rank

S

W-Engine effect

Rank SStun

Tiger Spirit Rising

The Daze dealt by the equipper's EX Special Attack, Chain Attack, and Ultimate increases by 28%. When using a Chain Attack or Ultimate to deal Fire DMG, the DMG dealt by all squad members increases by 10%, stacking up to 2 times and lasting 30s. The duration of each stack is calculated separately. Triggers once per use of a skill. Only one instance of this effect can exist in the same squad.

Overclock Table (★1 → ★5)

Official values straight from the publisher — every duplicate copy Overclocks the passive by one star, capped at ★5.

Upgrade	★☆☆☆☆	★★☆☆☆	★★★☆☆	★★★★☆	★★★★★
EX Special Attack, Chain Attack, & Ultimate Daze Increases	28%	32.2%	36.4%	40.6%	44.8%
Fire DMG Chain Attack/Ultimate squad DMG Increases	10%	11.5%	13%	14.5%	16%

Materials & Stats per Breakthrough Milestone (0 → 60)

The full ATK/sub-stat curve across all 7 milestones plus the materials each one costs, read straight from official data.

Lv.	Before	After	Material
Lv.0	ATK: - ATK%: -	ATK: 48 ATK%: 12%
Lv.10	ATK: 123 ATK%: 12%	ATK: 166 ATK%: 15.6%	Denny ×1,200 Stun Component ×4
Lv.20	ATK: 241 ATK%: 15.6%	ATK: 284 ATK%: 19.2%	Denny ×28,000 Reinforced Stun Component ×12
Lv.30	ATK: 359 ATK%: 19.2%	ATK: 402 ATK%: 22.8%	Denny ×60,000 Reinforced Stun Component ×20
Lv.40	ATK: 477 ATK%: 22.8%	ATK: 520 ATK%: 26.4%	Denny ×100,000 Specialized Stun Component ×10
Lv.50	ATK: 595 ATK%: 26.4%	ATK: 638 ATK%: 30%	Denny ×200,000 Specialized Stun Component ×20
Lv.60	ATK: - ATK%: -	ATK: 713 ATK%: 30%

Total materials for the full 0→60 climb

Denny ×389,200 Stun Component ×4 Reinforced Stun Component ×32 Specialized Stun Component ×30

Where To Farm

Combat Simulation — each Enemy Card costs 20 Battery, up to 5 cards per run (100 Battery for a full run).

Signature Holder

Roaring Fur-nace's exclusive signal W-Engine — equip it on the matching Agent to unlock the signature outfit.

Ju Fufu

Best Agents for this W-Engine

Recommended for

S

Ju Fufu S+

How to Get This W-Engine

Pull it from Signal Search using Master Tapes / Encrypted Master Tapes (bought with Polychrome) — S-rank W-Engines get their own banner, usually alongside the matching character's banner.

Trade for it at the Gadget Shop's Box Galaxy section (Sixth Street): costs W-Engine Components + W-Engine Chips + Denny; Chips come from disassembling spare W-Engines.

A handful of A/B-rank W-Engines unlock through Proxy Primer trials or as story/event rewards instead of the gacha — not every W-Engine is pullable.

Compare with Same-Specialty Picks

Other Stun-specialty W-Engines, sorted by rank — solid stand-ins while you don't have the signature.

W-Engines	Rank	Base ATK (Lv.60)
Roaring Fur-nace	S	713
Chief Sidekick	S	713
Neon Fantasies	S	713
Yesterday Calls	S	713
Spectral Gaze	S	713
Ice-Jade Teapot	S	713
Blazing Laurel	S	713

Official Artwork / Lore

Goodbye to the fate of the past, goodbye to the childhood that slipped away so quickly, goodbye to my father's embrace and my mother's smile, goodbye to the claws and the stripes, goodbye to the unmoving mountains and the clouds that never linger, goodbye to my mentor and old friends, goodbye to me, goodbye to me. As long as the world remembers, I once roared with courage. "Never fear! Your senior is here!" — Fufu's line when coming to the rescue.

Alternatives of the same specialty

Stun specialty — decent picks while you don't have this one

Chief Sidekick

Neon Fantasies

Yesterday Calls

Spectral Gaze

Ice-Jade Teapot

How to read this W-Engine page

Every W-Engine has 5 Refinement ranks (R1→R5): refinement ONLY strengthens the passive effect — the numbers in the table above run from left (R1, unrefined) to right (R5, max refinement via 4 duplicates or Overclock materials); Base ATK and the Advanced Stat (CRIT Rate/CRIT DMG/ATK%/PEN Ratio/Anomaly Proficiency...) do NOT change with refinement, only with the engine's level. "Best Agents for this W-Engine" prioritizes agents whose real build actually recommends this engine; if that data isn't available yet, the page falls back to agents sharing the same specialty as a rough guide. "Alternatives of the same specialty" lists other W-Engines with the same role — useful when you don't own the engine shown on this page.

FAQ

What is Roaring Fur-nace in Zenless Zone Zero?

Roaring Fur-nace is a rank S W-Engine built for the Stun specialty in Zenless Zone Zero — equip it on an Agent of the matching specialty to unlock the full passive effect; see the base stats and the full R1→R5 Refinement table in the sections above.

Which Agents should use Roaring Fur-nace?

Roaring Fur-nace fits Stun specialty Agents best, with 1 recommended characters including Ju Fufu — see the full list with portraits in the "Best Agents for this W-Engine" section above.

How much Denny and material does it take to upgrade Roaring Fur-nace, and where do I farm it?

Leveling Roaring Fur-nace through every milestone takes roughly 4 W-Engine components and Denny ×389,200, Stun Component ×4, Reinforced Stun Component ×32 Denny combined — the components drop from Combat Simulation; see the exact breakdown per milestone and the Battery cost in the "How Much You Need" and "Where to Farm" sections above.

Is Overclocking Roaring Fur-nace worth it?

Overclocking only strengthens Roaring Fur-nace's passive effect from ★1 up to ★5 (5 copies) — it never changes Base ATK or the sub-stat, so getting the base copy matters far more; treat extra copies as a bonus.

Where do I get Roaring Fur-nace?

Mostly through Signal Search gacha (Polychrome); a few A/B-rank W-Engines are tradeable at the Gadget Shop's Box Galaxy or come from story/event rewards — see the "How to Get" section above for details.