No, some eidolons can be argued worth keeping a second maxed copy of.
Tiamat is the easy example among event eidolons. Her atk is absurd; 2262 atk means that an on-element eidolon needs 2057 base atk to beat it. And her summon effect is... reliable. 750 HP barrier that lasts 3 turns every 10th turn. You know what you'll get from it every time you use it.
High base atk eidolons with decent enough effects are something you'd probably want if you're using an eidolon that checks the number of matching element sub eidolons.
Horus users may want another copy of Adramelech's 2058 atk and 3 turns of unknown amount of +double, as +double/+triple effects are nice to speed up burst gauge generation.
Pazuzu/Hanuman users may want another copy of Icarus's 2094 atk and 3 turns of unknown amount of +triple.
Nidhoggr users may want...uhhh, when the original koihime collab reprint happens, does the exchange reset? Cause a 2nd Meng Huo's 2100 atk would be nice for Nidhoggr users. If not, then uh, both Amaru and Yggdrasil are sitting at 1866 atk. They're not worth a 2nd copy of in the long run since the next 3 thunder eidolons are Tartarus/Medjed/Yato-no-kami (1950/1950/1998 atk respectively). So, yea, hope that the exchange resets for a 2nd Meng Huo :/
Illuyanka/Leviathan users want that 2nd Tiamat.
Managarmr users could possibly want a 2nd St. Nicholas's atk (1950), but that summon effect is annoying. If you're looking more for raw beefiness instead of snazzy effects, then there you go. The future light event eidolons with over 1800 atk are Yule Goat (1890) and Nandi (1986). So there's room for Sphinx/St. Nick/St. Nick/Yule Goat/Nandi if you're just looking at atk. The 2nd St. Nick may be replaced by Abou (1770) if you want her dark atk debuff.
For Anubis users... your options for simple to get 2nd copies just don't have high atk. Dark event eidolons in general don't have high atk. The highest two are Delphyne (2010) and Trivia (1890). The 3rd highest so far? Apocalypse at 1680 o.o
If you really want a 2nd copy then, maaaybe Jack o' Lantern (1602) for the zeal effect? Burst gauge generation is nice as long as you can tolerate the self burn aspect of zeal. But really, you're praying to roll a 2nd maxed copy of Trivia or Delphyne.
Of course, there are always the kaiser dragoons to take up one sub slot (not the main!). Although I don't actually what their atk exactly is at 0* (as I've only heard that it's still more than sufficient). But their summon effect is really good. They are the main priority in the eidolon orb shop for good reason. I only leave them out as I don't know when a particular individual should expect to pick one up, as the rate at which you get orbs varies from person to person.
Kaiser Dragoons have 445 HP and 1633 Attack at level 40.
559 HP and 2050 Attack at 55 (1*)
Amazing, thanks.
If already have Belial, is it still good to keep Horus (1st copy)?
There is any non event Eidonlon that should keep 2nd copy for the summon effect eg Farnir def++
Can u also pls explain base ATT vs on element ATT and where to see both numbers is game?
Many thanks
Super simplified, the damage formula is BaseAtk*CharacterAtk*ElementalAtk. CharacterAtk is the same as Assault, so once you upgrade your grids, you'll want Elemental Eidolons like Belial as your primary (ones that don't read "Fire CHARACTER Atk up").Only BaseAtk is shown ingame, in the Edit screen. The rest you'll just have to calculate yourself.
Base attack is what the game tells you when you check the details of an eidolon. So a lv 100 Horus has an attack of 1926 (without any +1's on it).
When I said 'on-element eidolon', the idea I'm expressing is that the eidolon has the same element as the soul & kamihime in a given team. Your soul and the kamihime gain a bonus of 10% from an eidolon if they're of the same element. So for fire souls/kamihime, that lv 100 Horus gives 1926*1.1 ~= 2118 or 2119 atk (I'm not sure if the game rounds up or down). You can see this in the HP/atk listed for your party members in the team edit screen.
The first lv 100 Horus can still probably hang around in the sub slot if you have Belial, depending on what else you have. It also depends on how much you're prioritizing atk over more useful summon effects from your sub slots. And whether you should prioritize one over the other will be fluid; it'll change depending on your team/how strong you are and the given encounter.
I'd probably keep the Horus around for the time being just to give myself the option if I ever want it. I tend to prefer keeping my options open (even the really hypothetical niche ones). Others will have their own preferences/priorities.
As far as non-event eidolons whose effects are worth a second copy of? That is, you're already using one of them (presumably maxed), and you managed to get yet another? Well, the kaiser dragoons of course. Their effect is what, 2 turns of +30% element and 30% resist against whichever element they're advantageous against on a 8 turn cooldown? That's a fantastic enough effect that you'd gladly have multiple of. Outside of that obvious answer? Hmm...
Behemoth against certain encounters (if you can survive the cooldown). It's not often , but some fights are designed to have the enemy able to paralyze or petrify you (screw you, Medusa). Sure, your soul and some kamihime have debuff cleansing abilities. But you can't use them when petrified (again, screw you, Medusa). Or paralyzed for that matter, IIRC. Again, it's the sort of thing that doesn't come up often, but if it does, you'd really like some counters.
Takemikazuchi's +15 burst gauge every 9 turns. I could see having two of them in rotation for +15 burst every 4/5 turns. I wouldn't say optimal, but it can be neat if it's what you need to push you into reliably bursting once per Takemikazuchi summon.
Anubis eats an overdrive orb with an alleged success rate of 75% every 10 turns. I like orb removal abilities with decent success rates, unlike the absurdly low, might as well be non-existant accuracy of Jack Frost.
I think that kaiser dragoons are absolutely worth using in a sub slot at 0*. I also think that's the consensus, given how often they're emphasized to be the most important thing to grab in the eidolon orb exchange. And there's only 1 copy of each in the exchange, so if you never draw one from the gacha, then at best you'll have a 0* kaiser.
The +30 to elemental attack is pretty nice. But I personally look more at the other aspect of their summon effect.
If you can't take out the enemy before it can wipe you out with whatever its major attack is, 2 turns of 30% element resist is really good on its own. That's usually sufficient to save your butt on its own, but not always. Then it becomes absurdly good when you take advantage of stacking rules.
Scrub, here. Where do you guys get EXP for your weapons and eidolons? I’ve been getting everything from the gem gacha, since it provides a fair amount of R weapons I can use for skill EXP. The time-limited SP quests seem kinda unreliable, but is that what everyone’s doing? I feel like my luck is just pure trash, and I don’t have a very good impression of it. What’s the easiest way to get things to lv100?