This guide analyzes the best Light Cones for The Herta in Honkai: Star Rail, a powerful 5-star Ice Erudition character. Her ideal stats focus on CRIT Rate, CRIT DMG, and ATK. Since her kit already provides substantial CRIT DMG, Light Cones boosting CRIT Rate are prioritized. Skill and Ultimate DMG boosts are also highly beneficial.
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The Herta's Light Cone options are evaluated below:
The Seriousness of Breakfast (S5)

- S5 Passive: Increases DMG by 24%. ATK increases by 8% per defeated enemy (stacks up to 3 times).
A readily available free Light Cone, suitable for early game. Provides straightforward damage boosts but is outperformed by other options later on.
The Day The Cosmos Fell (S5)

- S5 Passive: Increases ATK by 24%. CRIT DMG increases by 40% for 2 turns if at least 2 enemies are affected by a Weakness.
Another free option, slightly better than The Seriousness of Breakfast, but its effectiveness depends on consistently applying Weakness.
Eternal Calculus (S5)

- S5 Passive: Increases ATK by 12% + 8% per enemy hit (stacks up to 5 times). SPD increases by 16% for 1 turn if 3 or more enemies are hit.
A free 5-star Light Cone. ATK boost varies with the number of enemies. Solid when fully stacked, but inconsistent otherwise. The SPD boost can be advantageous.
Yet Hope Is Priceless (S1)

- S1 Passive: Increases CRIT Rate by 16%. DMG of follow-up attacks increases based on excess CRIT DMG above 120% (stacks up to 4 times). Ignores 20% of target DEF for 2 turns after Basic ATK, Ultimate, or follow-up attack.
Provides a good CRIT Rate boost, but The Herta doesn't fully utilize its follow-up attack buffs. Not recommended unless already owned.
Geniuses' Repose (S5)

- S5 Passive: Increases ATK by 32%. CRIT DMG increases by 48% for 3 turns after defeating an enemy.
A strong 4-star option. The CRIT DMG buff is easily maintained in most battles, but its effectiveness diminishes in prolonged fights against single bosses.
An Instant Before A Gaze (S1)

- S1 Passive: Increases CRIT DMG by 36%. Ultimate DMG increases based on Max Energy (up to 64.8% at 180 Energy).
Provides substantial CRIT DMG and Ultimate DMG boosts. However, The Herta benefits more from Skill DMG boosts, limiting this Light Cone's overall value. Not recommended unless already owned.
Before Dawn (S1)

- S1 Passive: Increases CRIT DMG by 36%. Increases Skill and Ultimate DMG by 18%. Follow-up attack DMG increases by 48% after using Skill or Ultimate (The Herta cannot utilize this).
Excellent unconditional stats. The CRIT DMG and overall DMG boosts significantly enhance The Herta's damage output.
Today Is Another Peaceful Day (S5)

- S5 Passive: DMG increases based on Max Energy (up to 64% at 160 Energy).
An exceptional 4-star Light Cone. Provides a substantial unconditional DMG boost, easily maximized by The Herta's high Energy cost. High base ATK is also a significant advantage. Excellent F2P option.
Night on the Milky Way (S1)

- S1 Passive: ATK increases by 9% per enemy (up to 45% with 5 enemies). DMG increases by 30% for 1 turn when Weakness Break is applied.
A strong 5-star option. High ATK boost depends on the number of enemies. Requires Weakness Break application for the damage buff. Performance fluctuates based on enemy count.
Into the Unreachable Veil (S1)

- S1 Passive: Increases CRIT Rate by 12%. Increases Skill and Ultimate DMG by 60% for 3 turns after using Ultimate. Recovers 1 Skill Point after using Ultimate if it consumed 140+ Energy.
The Herta's signature Light Cone and her best-in-slot. Provides significant CRIT Rate and DMG boosts to both Skill and Ultimate. Skill Point recovery is a crucial advantage. Highest base ATK among Erudition Light Cones.
This analysis helps players choose the best Light Cone for The Herta based on their resources and gameplay style. Remember that optimal Light Cone selection depends on team composition and overall strategy.