Firesmith of Lava-Forging
Firesmith of Lava-Forging is a relic set in Honkai: Star Rail with the following effects:
A Fire-element set that boosts Fire DMG and specifically Skill DMG, with a bonus after using the Ultimate, making it solid for Fire DPS characters who deal most damage through their Skill but less useful for other damage types.
Increases Fire DMG by 10%.
Increases DMG by the wearer's Skill by 12%. After unleashing Ultimate, increases the wearer's Fire DMG by 12% for the next attack.
The block below gathers main-stat recommendations by character ROLE (not tied to one character) — most EN aggregator sites push this to a separate build page; here it sits right on the set page.
Flat HP — fixed, not selectable.
Flat ATK — fixed, not selectable.
Standard DPS: CRIT Rate or CRIT DMG. Support/healer roles: HP% or Outgoing Healing.
ATK% for most DPS; SPD if the team needs to act first or for support/CC roles.
General substat priority: CRIT Rate > CRIT DMG > ATK% > SPD — reorder for the specific character's role; this is only a safe default.
How to read this relic set page
Cavern Relics have 4 pieces: Head and Hand always carry fixed flat stats (HP and ATK), so only Body and Feet have a random main-stat you actually choose. The 2-piece effect unlocks with 2 out of 4 pieces from the same set; the 4-piece effect is stronger but needs all 4 and usually has its own trigger condition — read the exact text above before committing. Planar Ornaments only have 2 pieces (Planar Sphere + Link Rope) and only ever have one 2-piece effect, there is no 4-piece version.
The two types also differ in where you get them: Cavern Relics drop from the Cavern of Corrosion and cost Trailblaze Power per run; Planar Ornaments come from the Simulated Universe or Divergent Universe, which do NOT cost Trailblaze Power — you trade for them with items or completion rewards instead. A full loadout usually combines one 4-piece Cavern set (or two different Cavern sets at 2 pieces each) with one 2-piece Planar set — go 4-piece when that set gives a large, reliable damage buff, and mix 2+2 when you need to stack several smaller stats (e.g. ATK% from one set plus Elemental DMG% from another).
The "who should use this" list is pulled from cross-sourced build consensus and updates automatically as the meta shifts, it is not hand-picked. See the full set table on the Relics page, or check terms in the HSR Glossary.