EvelynPick #1 of 6 · S1
Clearly the best: plenty of unconditional CRIT Rate and CRIT DMG, plus a very consistent stacking effect that lets Chain Attacks and Ultimates ignore up to 25% Fire RES, exactly where Evelyn deals her damage.
Effect
String & Melody
CRIT DMG increases by 50%. When the equipper enters the battlefield, or activates a Chain Attack or Ultimate, they gain 1 stack of Heartstring. Each stack of Heartstring allows the equipper's Chain Attack and Ultimate to ignore 12.5% of the target's Fire RES, stacking up to 2 times and lasting 30s. Repeated triggers reset the duration.
*Stats shown are at Base level.
Values at S1/S2/S3/S4/S5
Who Should Use Heartstring Nocturne
Ranks and notes come from each Agent's build guide on Zenless Builds.
Soldier 11Pick #1 of 6 · S1
Her best option by a clear margin. You get a huge amount of unconditional CRIT Rate and CRIT DMG, plus Fire RES ignore on her Chain Attacks and Ultimate.
AntonPick #1 of 6 · S1
An excellent stat stick. It gives a huge amount of unconditional CRIT Rate and CRIT DMG, so Anton crits constantly to trigger his Additional Ability.
NekomataPick #2 of 5 · S1
A stat stick with a CRIT Rate main stat and unconditional CRIT DMG. It holds up well among limited engines but still sits behind Steel Cushion.
Orphie & MagusPick #2 of 6 · S1
The best stat stick for Attack Agents: high ATK, CRIT Rate and CRIT DMG, plus Fire RES ignore on Chain Attacks and Ultimates. It lacks Energy Regen, but the gap to her signature is smaller than usual.
SeedPick #2 of 6 · S1
The best CRIT stat stick for Attack Agents: high CRIT Rate and CRIT DMG with no conditions.
BillyPick #2 of 6 · S1
A great stat stick with lots of unconditional CRIT Rate and CRIT DMG.
CorinPick #2 of 6 · S1
The best CRIT stat stick for Attack Agents, providing a huge amount of CRIT Rate and CRIT DMG.
HugoPick #3 of 6 · S1
The best CRIT stat stick for Attack Agents, with even more CRIT DMG than Myriad Eclipse, but Hugo can't use its other effects. Still a strong option that needs no special handling or teammates.
Soldier 0 - AnbyPick #3 of 6 · S1
Evelyn's signature works as a solid stat stick thanks to its flat CRIT Rate and CRIT DMG, even though she can't use its in-combat effect.
EllenPick #4 of 6 · S1
The best generic CRIT stat-stick for Attack Agents, offering lots of CRIT Rate and CRIT DMG. CRIT DMG can be saturated on Ellen, but the raw stats keep it competitive.
HarumasaPick #4 of 6 · S1
A great stat stick: tons of unconditional CRIT Rate and CRIT DMG, so even without its special effect it beats similar W-Engines.
PyroisPick #4 of 6 · S1
A CRIT Rate main stat and +50% CRIT DMG. Its Fire RES ignore does nothing for Pyrois' Ether damage, so it mostly works as a stat stick.
BenPick #5 of 6 · S1
A stat stick with CRIT Rate. It's slightly behind Hailstorm Shrine because of its lower Base ATK.