ⓘ

The undisputed top: Altria Caster (Castoria), Koyanskaya of Light, Oberon and Scáthach-Skadi (Ruler) - the four supports almost every farming team is built on. For damage, Kukulcan, Morgan, Space Ishtar, Melusine and Arjuna (Alter) lead the DPS side.

S+ - account-defining supports

ServantClassWhy mandatory
Altria CasterCasterThe Arts engine - 50% NP battery plus invincibility; enables nearly every 3-turn Arts farm
Koyanskaya of LightAssassinBuster battery + cooldown cut - the other half of modern farming
OberonPretenderMassive NP damage steroid for the final wave - the finisher's support
Scáthach-Skadi (Ruler)RulerQuick's cornerstone - crits and Quick batteries all in one

S - best damage dealers

Consensus S-tier picks across both major lists - farm- and boss-viable.

AoE farmers

Kukulcan, Space Ishtar, Melusine, Ibuki-Douji (Berserker), Mysterious Executor C.I.E.L, Space Ereshkigal, Morgan (risen to S this list).

ST / challenge picks

Arjuna (Alter), Super Orion, Melusine (Ruler), Kama, Enkidu, Tezcatlipoca.

Support-adjacent

Lady Avalon, Merlin, Sima Yi (Reines), Zhuge Liang, Xu Fu, Tamamo-no-Mae.

Budget legends

Chen Gong and Arash - the low-rarity monsters who out-farm gold servants for free.

Best low-rarity servants

ServantWhy
Chen GongSacrifices himself to carry another servant's NP - the budget 3-turn machine
ArashOne-and-done wave clearer since launch - still the cheapest fast farm in the game
Habetrot / ParacelsusRider and Caster supports that patch holes in budget teams

FAQ

Who should a new account reroll for?

Castoria above all - one S+ support changes the whole account. For 4-stars, Heracles, Carmilla and EMIYA are the classic keeps.

Is this list for NA or JP?

NA - JP runs roughly two years ahead on releases, so servant evaluations differ.

Did anything change recently?

Morgan, Space Ishtar and Super Orion all climbed to S in the latest update - the support tier is unchanged.