Idle Heroes Lethia Build and Core of Origin Investment Guide

In Idle Heroes, invest in Lethia as a primary damage carry only if you have four Core of Origin chests available to take her Core directly to 3-star Noble rank (also referred to as an SSS Core). Without a Noble Core, Lethia functions primarily as a secondary crowd-control hero and cannot match the output of established carries such as Doom Terminator Vulcan or Lord of Fear Aspen.

If your account already has an established support lineup, commit your resources to Lethia by prioritizing her active skill sublimations, equipping an energy or control artifact, and speed tuning her to attack directly after your support buffers.

Core of Origin Investment Thresholds

Lethia relies on the cumulative skill multipliers and secondary trigger effects unlocked across her Core levels. Taking her Core of Origin to Noble rank transforms her combat pattern by granting immediate round-start energy, boosted attack scaling, and damage amplification against crowd-controlled or stat-stripped enemies.

Noble Rank (3-Star Core): Grants the full burst cycle needed to wipe enemy frontlines or force early defensive triggers in round one. Focus all Core chests on reaching this milestone before splitting resources across secondary heroes.
Base to 2-Star Core: Provides standard Transcendence stat upgrades and partial passive scaling. At this investment level, Lethia cannot reliably carry Void Campaign stages on her own.

Do not spend 5,000,000 Transcendence Crystals and Core chests on Lethia if your account still lacks essential support heroes like Halora, Freya, and Natalia. Lethia lacks self-sustaining team defense and requires functional support heroes to survive and cycle active skills.

Sublimation and Void Imprint Priorities

Lethia's kit includes natural survival mechanisms, so her imprints and sublimation paths should emphasize offensive scaling.

Void Imprints

Holy Damage
Crit Damage
Damage Reduction (swap to Crit Rate if your team lacks consistent critical strike buffs)

Sublimation Sequence

Active Skill: Sublimate this tree first to maximize damage ratios, target limits, and round-one burst.
Passive 2 and Passive 3: Sublimate these nodes second to increase her counter-attack damage when enemies cast active skills and to boost multi-round stat scaling.
Basic Attack: Leave this tree for last. Basic attack upgrades provide minor utility and should only receive materials after your primary lineup's key nodes are finished.

Artifact Selection

Choose Lethia's artifact based on whether you need immediate round-one burst, crowd-control consistency, or stage-specific survival:

Artifact	Primary Use Case	Strategic Function
Melodic Strings	Void Campaign & Fast PvP	Grants full starting energy to cast her Noble Core active before enemy disruptors move.
Ruyi Scepter	Control-Resistant Stages & Bosses	Increases control precision to guarantee crowd-control procs on priority targets.
Golden Crown	Burst-Heavy Void Campaign Stages	Mitigates high incoming backline damage during rounds one and two.
Lucky Candy Bar	Stun-Heavy Stages	Provides protection against early stun-lock compositions that interrupt her rotation.

Team Speed Tuning and Positioning

Lethia should never move first on your team. Firing her active before your supports move causes her to hit full-health, unstripped targets without offensive buffs. Tune your team's speed brackets so that buffers and debuffers act immediately before Lethia.

Energy and Buff Setup: Heroes such as Fairy Queen Freya, Mystic Fairy Freya, or Star Alchemist Holmes Young must act first to grant attack buffs, apply crowd control, and strip enemy Unbending Will shields.
Burst Execution: Lethia acts in slot 3 or 4 directly following the support wave, releasing her Noble Core active into weakened targets.
Cleanup: Secondary carries or utility heroes fill slots 5 and 6 to eliminate survivors and maintain crowd control through the remainder of the round.