Roaring Fur-nace Guide: Ju Fufu's Signature S-Rank W-Engine in ZZZ

In Zenless Zone Zero, Roaring Fur-nace stands out as a highly specialized S-rank W-Engine rather than a universal upgrade. As the signature weapon of Ju Fufu, it is designed around Fire Stun gameplay and rewards Agents who pressure enemies with EX Special Attacks, Chain Attacks, and Ultimates. Its appeal is easy to understand: the engine can raise the damage of the entire party, regardless of each member's Attribute, but only after the equipper lands Fire DMG. That condition keeps Roaring Fur-nace firmly inside the Fire Stun niche and makes Ju Fufu its most natural wielder.

Stats and Effects

Roaring Fur-nace is an S-rank W-Engine with a clear offensive-support identity. The reference data does not present it as a generic stat stick; instead, its value comes from a passive that amplifies party damage once the equipper applies Fire DMG. Because the buff reaches all party members regardless of their own Attribute, the engine can fit into mixed teams as long as the wielder can reliably trigger its condition.

Category	Details
Rarity	S-rank W-Engine
Signature Agent	Ju Fufu
Preferred Role	Fire Stun
Core Trigger	Equipper deals Fire DMG
Team Benefit	DMG increase for all party members, regardless of Attribute
Ability Focus	EX Special Attacks, Chain Attacks, and Ultimates
Acquisition	Exclusive W-Engine banner

The engine's main limitation is equally important. A non-Fire Stun Agent may hold it, but that Agent will struggle to activate the passive consistently. For that reason, Roaring Fur-nace is best treated as a dedicated Fire Stun tool. Ju Fufu benefits most because her kit naturally supports the Fire-pressure playstyle the engine demands.

Best Characters

Ju Fufu is the primary and most recommended user of Roaring Fur-nace. As its signature owner, she aligns with every major requirement: Fire DMG application, Stun-oriented team utility, and heavy reliance on EX Special Attacks, Chain Attacks, and Ultimates. The engine effectively extends her role from breaking enemies to boosting the whole squad's damage output.

Other Fire Stun Agents can make situational use of the engine, especially those with frequent Fire application and burst-heavy rotations. However, the recommendation order is clear:

Rank	Recommended User	Why It Works
1	Ju Fufu	Signature synergy; natural Fire DMG trigger; strong EX, Chain, and Ultimate cycles
2	Other Fire Stun Agents	Viable when they can apply Fire DMG often and support party damage windows
3	Non-Fire Stun Agents	Not recommended; passive activation becomes unreliable

The engine's team-wide DMG increase is its standout feature, but it should not be confused with a universal buff. Proxies must pair it with an Agent who can satisfy the Fire DMG condition without sacrificing rotation quality.

How to Get Roaring Fur-nace

Roaring Fur-nace is an exclusive W-Engine. It does not appear in the standard pool, so Proxies cannot obtain it through ordinary permanent pulls or unrelated banner drops. Its most recent rerun arrived in the Dazzling Melody W-Engine banner during Phase 2 of Version 2.3, which ran from November 5 to November 25, 2025. That rerun has ended.

As of 2026, players should treat Roaring Fur-nace as a limited-time target that may return in a future W-Engine banner. Because another rerun could occur, Fire Stun enthusiasts and Ju Fufu users should keep an eye on official banner schedules and save resources accordingly. The engine remains unavailable through any other confirmed means.

Ascension and Materials

Like other W-Engines, Roaring Fur-nace improves through leveling and ascension. Ascension raises its level cap and supports higher base stats, while the passive effect remains tied to the Fire DMG trigger. Proxies planning to build it should pre-farm the required W-Engine ascension materials and Dennies rather than scrambling after a rerun is announced.

The material chart above summarizes the per-ascension costs. Exact farming routes and material names are best confirmed in-game, but the preparation logic is straightforward: gather the full ascension set before committing to the engine, especially if Ju Fufu is also being built at the same time.

Final Verdict

Roaring Fur-nace is a powerful but narrow S-rank W-Engine. It shines for Ju Fufu and other Fire Stun Agents who can reliably trigger its Fire DMG condition while cycling EX Special Attacks, Chain Attacks, and Ultimates. Its party-wide DMG increase gives it real team value, but the activation requirement prevents it from becoming a universal pick. For Proxies who main Ju Fufu, it is a signature upgrade worth waiting for. For everyone else, it is a specialized tool that should be pulled only with a clear Fire Stun plan. 🔥