Salem Boss Guide Section 5 - 3

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Enemy Layout

Battle 1/3
Dragonbone Warrior
Dragonbone Warrior
Dragonbone Warrior
Battle 2/3
Demon Boar
Demon Boar
Demon Boar
Fatal Battle 3/3
Caster of Okeanos
Caster of Okeanos

Boss Statistics

Caster of Okeanos
Caster HP
NP Bar

NP Type
Up to 2 per turn
Female, Humanoid, Servant, Heaven or Earth, Argonaut, Weak to Enuma Elish
Break Rapid Words of Divine B: Increase own NP Gauge by 2.
Skill 1 Rapid Words of Divine B: Increase own NP Gauge by 2.
Skill 2 Poisoned Meal A: Inflict Poison on all enemies (3 turns). Decrease DEF for all enemies (3 turns).
Skill 3 Advice for Sailing A: Increase Critical Rate for all allies (3 turns). Remove Debuffs for all allies.
NP Metabo Piglets: Deal damage to a single enemy. Transforms them into a Pig (1 turn) - similar to Stun. Decrease Critical Star Drop Rate for a single enemy (3 turns).


  • Note: This boss really isn't very difficult and mainly becomes more difficult if fielding Caster teams. The advice here is mainly relevant for Masters not fielding a strong Rider.

  • Bringing a dose of her poison, the cute yet deadly Caster of Okeanos appears as a piglet-spamming adversary in our journey through Salem. 

  • Masters should make sure to take advantage of the first two enemy waves to build up NP gauge for the team, as well as conserving buffs until facing off against Caster of Okeanos. 

  • Unlike many boss fights from Shimousa, this fight does not have a complicated set of gimmicks. Thus, simply stacking up on offensive buffs and high damage (ST) NPs will do the trick.

  • With her high tendency to use her Rapid Words of Divine skill, Caster of Okeanos can charge her own NP gauge very quickly as . Whether or not she uses it during her turn is random, thus she can catch Masters off-guard with her high damage Noble Phantasm.

  • Warning: Rapid Words of Divine grants 2 charges instead of the usual 1.

  • When close to breaking her first Break Bar, Masters should take note of her current NP Gauge as she will immediately cast Rapid Words of Divine upon break. 

  • The Rapid Words of Divine from her Broken HP Bar will not take up an action - she will likely charge her NP Bar by 4 that turn by using her first normal action to charge as well.

  • Without Defensive buffs, Casters of Okeanos is likely to hit 25k-30k with her NP.

  • Her Metabole Piglet debuff from her Noble Phantasm can slow down DPS even if it does not kill. It can be cleansed by debuff clear skills, or prevented through debuff immunity. 

  • Caster of Okeanos has no way to bypass Evade or Invincibility so both statuses are good defensive options to survive her Noble Phantasms.  

Team Recommendations

  • Masters bringing their DPS Casters as opposed to a class advantaged Servant for the bonus bond points (with a Support Caster for the Lunchtime CE), should bring their best Single Target Casters such as SanzangIllya, Caster of MidrashNero Claudius (Caster) or Medea. Stock them up with plenty of offensive buffs.

  • For an easy clear, Single Target Riders make for the best DPS options, followed by Alter Egos or Berserkers if Masters lack strong Rider options. Sakata Kintoki (Rider), Ozymandias and Quetzalcoatl are all fantastic single-target Rider options to burst down Caster of Okeanos’ two HP bars in quick succession with team support. 

  • Masters who favor a more aggressive approach should bring plenty of offensive Support Servants to quickly deplete Caster of Okeanos’s HP bar, especially supports with NP Battery skills such as Merlin, Zhuge Liang, William Shakespeare or Helena Blavatsky.  

  • The Mystic Code Chaldea Combat Uniform is naturally the best for a buff-stacking strategy, and the stun helps to prevent any early NP shenanigans. Similarly, Anniversary Blond is a great alternative for Masters wanting to use Buster Critical teams. 

  • For Masters favoring a more stable approach, debuff removal is decent for this fight, as it can remove Caster of Okeanos’s stacking team-wide poison debuff, as well as the Metabole Piglets status from her Noble Phantasm. Servants such as Jeanne d’Arc, Saint Martha (Rider), Medea (Lily) or Florence Nightingale can help prevent unfortunate bacon accidents.

  • Servants with Taunts such as Chevalier d’Eon, Georgios, Leonidas or Mash Kyrielight can serve as a lightning rod for Caster of Okeanos’s Noble Phantasm to protect the main DPS when the need arises. 

  • Similarly, Servants that grant teamwide Evade or Invincibility like David or Tristan can help the team survive through her Noble Phantasm, but require good timing on the Master’s part.

Video Links

Note that these videos are not affiliated with GamePress, but showcase some lineups that are effective in clearing the final challenge. These can serve as a good reference for how to rotate skills during this quest or simply to have a look at the encounter before diving in.

Quick Servant Suggestions

- Recommended
Show her who can make the best piglet!
Caster of OkeanosCaster of OkeanosCaster of OkeanosCaster of OkeanosCaster of OkeanosCaster of OkeanosCaster of Okeanos
Single Target DPS
Xuanzang SanzangIllyasviel von EinzbernQueen of ShebaNero Claudius (Caster)Leonardo da VinciMerlinMedeaGilgamesh (Caster)
Sakata KintokiMecha Eli-chanMecha Eli-chan Mk.II Jeanne d'Arc (Alter)Hijikata ToshizoPenthesileaLu Bu Fengxian
Support With Skill-based NP Charge
MerlinOsakabehimeHelena Blavatsky (Archer)Parvati
Damage Supports
Minamoto no Raikou (Lancer) PenthesileaPaul Bunyan Queen of Sheba Ishtar (Rider)
Queen of Sheba
OsakabehimeWu Zetian Ishtar (Rider)
Debuff Clear Support
Caster of Okeanos Medea BBMinamoto-no-RaikouRyougi Shiki (Saber)Charles-Henri Sanson
Defensive Support
Taunt Support
Last Man / Solo