Being a gacha game, Honkai: Star Rail offers players additional ways to make their characters stronger, including light cones, relics, and talent upgrades. One primary way to further increase a character's potential is through Eidolons, which are unlocked when players obtain more copies of the character, up to a total of 6 additional copies. This system bears a striking resemblance to Genshin Impact, another successful title in the HoYoVerse, which also relies on gacha mechanics to enhance character utility through constellations.
While most characters in Honkai: Star Rail are already strong even without Eidolons, particularly the 5-star characters, players can still benefit from prioritizing certain constellations and paying attention to rate-up characters during their pulls. It's worth noting that only E1, E2, E4, and E6 provide unique benefits, while E3 and E5 increase the trace level of characters' skills and ultimate. The value of an Eidolon may not always be immediately apparent or comparable, but for players seeking to maximize value, understanding the priority of each character's Eidolon can help determine when to stop pulling and avoid spending more Stellar Jade than essential. Here's an alphabetical list of all available characters and their Eidolon priorities.
Arlan
- Eidolon Priority: E2 > E4 > E6 > E1
Arlan's Eidolons primarily focus on his HP management, as his skill has limitations based on his HP percentage. Among his Eidolons, the second one is the most useful, as it allows him to deal more damage with his skill and dispel a debuff on himself. Additionally, E4 can greatly enhance Arlan's survivability by preventing him from being knocked down once per battle. This survivability benefit is particularly important in content like Forgotten Hall, where obtaining more stars may depend on it.
Asta
- Eidolon Priority: E2 > E4 > E6 > E1
Asta's Eidolons mainly focus on her charging stacks, which she obtains through her Talent. These stacks allow her to further buff her allies based on the number of enemies hit after Asta uses her skill. Therefore, maintaining a high number of stacks consistently is always beneficial for Asta. Among her Eidolons, only the second and sixth ones help prolong the duration of the stacks. Additionally, the fourth Eidolon is valuable as it helps Asta generate more energy, allowing her to use her Ultimate more frequently and extend the duration of her buffs for her allies.
Bailu
- Eidolon Priority: E4 > E6 > E1 > E2
Bailu is already a great healer even without any Eidolons, but surprisingly, her best Eidolons provide even more utility to the party in addition to enhancing her healing capabilities. For instance, her E4 Eidolon is highly beneficial as it enables the healed ally to deal increased damage in subsequent turns, granting Bailu some offensive support potential. However, this may not be as useful when Bailu needs to heal non-DPS units. On the other hand, her E6 Eidolon proves particularly useful in content such as the Forgotten Hall, where avoiding being knocked down altogether is necessary for earning one of the stars. With the ability to save allies twice instead of just once, Bailu's effectiveness is further enhanced particularly in the end-game content.
Bronya
- Eidolon Priority: E2 > E6 > E1 > E4
Bronya is widely regarded as one of the best support units, although she does have one primary drawback: her skills consume a significant amount of skill points, especially if players don't have access to her signature light cone. However, in addition to her light cone, her Eidolons, such as E1 and E6, can greatly assist in managing skill points. Her second Eidolon, in particular, is highly valuable as it provides a speed buff to the targeted ally, allowing them to attack multiple times in a turn before the enemy can react. On the other hand, her fourth Eidolon is not as impactful since it only affects her basic attacks. Nevertheless, it can still prove useful for breaking enemy weaknesses in certain situations.
Clara
- Eidolon Priority: E1 > E2 > E6 > E4
Players who own Clara are fortunate because her best Eidolons are among her earliest ones. This enables players to maximize Clara's counter and damage potential without the need to invest in her later Eidolons. Her first Eidolon ensures that enemies retain their Mark after Clara uses her skill, thereby further enhancing Svarog's counter abilities. Additionally, her second Eidolon boosts Clara's ATK by 30% after she employs her Ultimate, which is a significant increase.
Dan Heng
- Eidolon Priority: E4 > E2 > E1 > E6
Dan Heng's Eidolons provide him with various benefits, each enhancing different aspects of his kit. Particularly noteworthy is his fourth Eidolon, which grants him an additional attack after defeating an enemy with his Ultimate by advancing his action. This ability bears some resemblance to Seele's Talent. Furthermore, his Eidolons offer buffs such as increased Crit Rate, further debuffing enemy speed, or enabling more frequent activation of his talent.
Gepard
- Eidolon Priority: E1 > E2 > E6 > E4
Similar to Clara, Gepard benefits the most from his earlier Eidolons, as they provide the entire team with a turn advantage and defensive benefits. With his first Eidolon, Gepard can more easily Freeze enemies, while his second Eidolon allows him to further reduce the speed of Unfrozen enemies, who are already slowed down due to the Freeze effect. However, his E6 and E4 Eidolons may not be as impactful. The E6 Eidolon can only trigger once per battle, and the E4 Eidolon grants allies an Effect Res buff instead of providing additional utility or offensive stats.
Herta
- Eidolon Priority: E6 > E4 > E2 > E1
While players can unlock some constellations for Herta by completing Simulated Universe levels, her most powerful Eidolons are unfortunately not accessible through this method. Her sixth Eidolon is the most significant, as the rest of her Eidolons primarily focus on her Talent, which only triggers once per enemy, making them less useful in certain content. However, Herta can obtain a significant attack boost after using her Ultimate thanks to her sixth Eidolon. Although she may not be able to use her Ultimate frequently, it still provides a more consistent way to increase her attack potential compared to other options.
Himeko
- Eidolon Priority: E1 > E4 > E6 > E2
Himeko's Eidolons are generally quite useful due to their strong buffs, but her first Eidolon stands out as the most valuable. After her follow-up attack, her speed increases, which provides significant value as speed is a highly important stat for most characters. Additionally, her fourth Eidolon enables her to activate her follow-up skill more frequently, which is particularly beneficial in teams focused on inflicting weakness breaks regularly. While not as high of a priority, her sixth Eidolon notably enhances her Ultimate by increasing the number of hits, making it easier to deplete the toughness meter when applicable.
Hook
- Eidolon Priority: E4 > E6 > E2 > E1
Hook's best Eidolons primarily enhance her potential as a burn DoT focused character. Her fourth Eidolon improves the base chance of Burn, while her second Eidolon extends its duration. Additionally, her sixth Eidolon increases all of Hook's damage, including the damage from Burn itself when inflicted on enemies. These Eidolons make Hook an excellent choice for teams focused on DoT and Break Effects, as they enhance her abilities without requiring as much emphasis on effect hit rate while building her.