Lamp of Nether Road

A Sonata set only counts how many equipped Echoes share its family — Cost, rarity, and slot position don't matter. 2 Echoes from the same set turn on the 2pc bonus: a flat +10% element damage bonus, or +10% healing bonus on sets built for sustain roles. That number is identical across every Sonata set in the game, which makes the 2pc threshold the cheapest stat stick available.

5 Echoes from the same family instead turn on the 5pc effect, and this is not a bigger version of the 2pc bonus — it's a separate effect (extra Deepen, a stacking buff, an on-swap trigger, and so on) that a character's whole kit is usually built around. There's no partial credit at 3 or 4 pieces; the set only reads 2pc or 5pc.

Because every character's Echo loadout follows a fixed 4/3/1 Cost split (three 4-cost, one 3-cost, one 1-cost — the standard 43311 loadout, some builds run 44111), whether it's worth chasing this set's full 5pc or just borrowing its 2pc bonus depends on the character's role, not just the element it's tagged to.

• Main DPS whose damage scales off their own element and its negative status (Aero Erosion, Spectro Frazzle, Glacio Chafe, Fusion Burst, Havoc Bane, Electro Flare) wants the full 5pc when this set matches their element — the Deepen it grants multiplies against ordinary damage bonus rather than adding to it, so losing it costs more than a flat percentage.
• Sub-DPS contributing element damage mid-rotation can run this set's full 5pc once Calamity echoes are farmed, or lean on its 2pc bonus in the meantime.
• Support or healer characters rarely need a full 5pc of an element-scaling set — a utility-oriented Sonata set, or this set's 2pc bonus alongside a different 2pc, usually serves them better.

The 4-cost Echoes carrying the strongest main stats — Crit Rate, Crit DMG, Healing Bonus — are the Calamity tier, and they only drop from Tacet Field boss encounters, gated by Waveplate (the same stamina resource most other end-game farming shares). Lower-cost pieces of the same Sonata family drop from regular field enemies and cost no Waveplate at all, so it's worth clearing those out first before spending Waveplate on the boss.

Because Waveplate is shared across every Tacet Field target, farming this set and a different 5pc set for two characters at once roughly doubles how long either one takes to finish. Commit to one boss and one set until that character's build is done before moving on.

Running this set's 2pc bonus alongside a different set's 2pc (a 2pc+2pc+2pc build), or pairing its 2pc with a 3pc from elsewhere, is a legitimate choice — not just an unfinished build — in two situations. First, when there aren't enough well-rolled Calamity echoes of this set yet: three mediocre-substat 4-cost pieces jammed into a 5pc often lose to two 2pc bonuses built from Echoes with good Crit Rate/Crit DMG rolls. Second, when this set's 5pc trigger condition genuinely doesn't fit the character's rotation — a 5pc that only fires on Resonance Liberation gains little on a kit that barely uses its ult, while a flat +10%/+10% split from two 2pc bonuses fires every rotation regardless of timing.

Element main DPS should almost never split away from this set's 5pc if it's their matching element, since the Deepen loss is multiplicative. Sub-DPS and most supports are where the split earns its keep.

Substat priority doesn't change with the Sonata set equipped, but it's worth restating while farming this one. At level 25, a 4-cost Echo caps at Crit Rate 22.0% or Crit DMG 44.0%, a 3-cost caps at Element DMG 30.0% or Energy Regen 32.0%, and a 1-cost caps at HP% 22.8% or flat HP 2280.

• Main DPS: Crit Rate and Crit DMG substats first, then ATK% and the matching skill-type damage bonus, with flat ATK and Energy Regen lower priority.
• Sub-DPS / buffer: same Crit-first order as DPS, but weight Energy Regen noticeably higher so Outro/Intro swaps land on time.
• Healer / support: HP% and Energy Regen first, DEF% next, with Crit substats treated as near-irrelevant bonus rolls rather than a build target.

Aim for roughly a 1:2 Crit Rate to Crit DMG ratio on any Crit-focused build — the standard baseline the game's own Crit scaling (5% base rate, 150% base damage) is built around.