Short version, because you probably came here for a yes or no: for the overwhelming majority of players, no, you do not need Eidolons. A well-built E0 five-star with the right relics clears Memory of Chaos, Pure Fiction, and Apocalyptic Shadow. Every one of them. Eidolons are a luxury that makes clears faster and flashier, not a requirement to clear at all.
That said, the answer changes depending on the character, and some Eidolons are so strong they rewrite a unit. So the useful question is never "are Eidolons worth it" in general. It is "is this Eidolon on this character worth the pulls." Here is how to tell.
What an Eidolon actually is
Every character has six Eidolons, E1 through E6, and each one unlocks by pulling a duplicate of that character. For limited five-stars, the only way to get dupes is to win the banner again, which is why deep Eidolons are the domain of heavy spenders. Standard five-stars can pick up Eidolons slowly through the Starlight (Undying Starlight) shop, and free units like the Trailblazer earn theirs through gameplay and the Herta store, so those two groups are the exceptions where dupes are realistically free.
The catch that trips people up: the jump from E0 to E1 costs exactly as much as the jump from E5 to E6, one full copy, but the two are worth wildly different amounts.
The breakpoints that matter (and the ones that don't)
Eidolon value clusters at predictable spots. As a rule of thumb across the roster:
- E0 is the intended experience. Balanced, complete, clears all endgame. This is where F2P and light spenders should stop.
- E1 and E2 are where the good value lives when it exists. Many supports and sustains get a defining quality-of-life or uptime boost here, occasionally a bigger power spike than the same investment in gear would give.
- E3 and E5 are "level" Eidolons that just raise ability levels. Real, but small, and never the reason to pull.
- E4 is another passive, usually modest.
- E6 is the fantasy tier: a character's ceiling, often a genuine transformation, and almost never a sensible spend unless money is no object.
The pattern to internalize is that support Eidolons tend to punch above damage-dealer Eidolons for the pulls. A harmony or preservation unit at E1 or E2 can lift your entire team; a DPS at E1 usually just does a bit more of what it already did. If you are going to spend on a dupe at all, spending it on the support you run in every team is often the highest-value pull in the game.
The move most players get wrong: Eidolon vs Light Cone
Here is the decision that actually matters for anyone with limited pulls. A character's signature Light Cone is its own banner, and for a lot of damage dealers, S1 of the signature cone beats E1 of the character. A cone brings a big flat stat block plus a passive built specifically for that unit, and it works every rotation. E1 on a DPS is frequently a conditional bump you only see under the right conditions.
So the priority ladder for a carry you love usually reads:
- E0 with strong relics and a good Light Cone (even a free or battle-pass cone).
- Signature Light Cone (S1) if you want the next real power jump.
- E1 only after the cone, and only if you have pulls to spare.
Light Cone Superimposition (S1 through S5) works the same way as Eidolons but for the cone: each dupe of the same Light Cone raises its effect. S1 is the meaningful step. S2 through S5 are steep diminishing returns you should never chase on a limited cone.
What this means for F2P and Dolphins
If you are free-to-play or a light spender, treat your Stellar Jade like the scarce resource it is. Winning one character's banner and building them properly does far more for your account than getting a second copy of anyone. Breadth beats depth: a roster of six well-geared E0 units clears more content, more comfortably, than three E2 units and a lot of empty roles.
Spenders chasing E1 or E2 on a beloved support are making a defensible call. Spenders chasing E6 on a DPS are buying a flex, and that is fine as long as they know that is what it is.
The quick gut-check before you pull a dupe
Ask three questions and you will almost never regret the decision:
- Do I already have a strong E0 build on them? If not, gear and a cone come first, every time.
- Is it a support or a carry? Support Eidolons are usually the better buy.
- Would those same pulls get me a new character I don't have? For most accounts, a new unit and a new role is worth more than a dupe.
Get those three right and Eidolons stop being a source of FOMO. They become what they were designed to be: an optional victory lap for the characters you love most. New to the game? Start with the beginners guide and the tier list to decide who is worth your first guarantee, then come back here before you ever spend on a second copy.
