Artoria Caster, better known in the Fate/Grand Order community as Castoria, is one of the most powerful and game-changing support Servants in this RPG. She debuted during the 5th Anniversary event and quickly became a must-have for any player serious about clearing harder content or farming more efficiently.

Unlike her Saber version, Castoria isn’t here to swing swords—she’s here to supercharge your team with massive buffs, charge Noble Phantasms fast, and keep allies alive longer. She’s a top-tier Arts support who excels at making even average Servants feel broken when placed in the right comp.

Limited Availability

Before jumping into what Castoria can do, it’s worth mentioning that, as a limited 5-star Servant, Castoria only shows up during specific banners—most often tied to anniversaries or big story chapters. That means if you see her available, it’s worth using your Quartz if you’re building an Arts-focused team.

What Makes Castoria Special

Servants in Fate/Grand Order basically come in all shapes, sizes, and skill sets.Castoria is built around Arts synergy and team-wide support. Her entire kit is focused on improving NP gain, boosting damage, and enabling fast NP looping. She’s especially powerful when paired with Arts-focused DPS Servants like Space Ishtar, Summer Musashi, or even Chloe.

Her Noble Phantasm, Around Caliburn, removes debuffs, boosts the party’s attack, and grants Anti-Purge defense, which protects from buffs being removed. This combo of offense and utility is rare and gives her an edge in both farming and boss fights.

Her Skills and How to Use Them

Castoria’s skill set is simple but extremely effective. All three skills contribute to keeping your team powered up and ready to fire off back-to-back NPs.

• Charisma of Hope: Gives the whole team an ATK buff and a 30% NP gauge charge. Start with this in nearly every battle.
• Protection of the Lake (1st Ascension): Recharges an ally’s NP gauge and increases the NP generation of the entire party for a duration.
• Caliburn: Sword of Selection EX (3rd Ascension): Buffs an ally’s Arts skills for a duration, and also boosts their damage towards “Threat to Humanity” enemies. Also makes the target invincible for 1 turn.

Leveling all three skills to 10 is highly recommended, especially the first one for the consistent 30% NP boost.

Best Team Compositions

While you can’t run multiple copies of Castoria in one team, pairing your own Castoria with a support Castoria borrowed from your friend list is the gold standard. This setup enables strong NP looping for Arts-focused damage dealers, making it one of the most efficient farming and challenge setups in the game.

If you’re building around Castoria for farming, your best bet is to look for Arts-looping Servants with decent NP batteries. Some strong picks include:

• Emiya (Archer) after his third skill rank-up (works for 2 NPs, but struggles with full looping)
• Rider Da Vinci, Musashi Berserker, and Space Ishtar, if you have them from past banners or GSSR pulls
• Summer Kama, who’ll debut in an upcoming event and is nearly on par with Space Ishtar

For high-difficulty quests, Castoria also shines in teams with Morgan or Melusine, especially when paired with Merlin. This hybrid frontline gives you damage, healing, and incredible survivability. Even non-loopers can benefit from Castoria’s Arts buffs and invincibility if you build around strategic NP timing rather than pure speed.

Whether you’re farming dailies or tackling tough content, Castoria adapts well to most teams. Just make sure your DPS has an Arts NP and enough gain to take advantage of her powerful support.

Ideal Craft Essences and Append Skills

To get the most out of Castoria, you’ll want CEs that increase her NP generation or start her off with more NP gauge. This ensures she gets her NP off early and can keep buffing the team. Here’s a good example to get you started:

• Prisma Cosmos (passive NP gain)
• Chaldea Teatime (extra Bond points and charge)
• Azure Magical Girl (NP gain and charge)

For Append Skills, her third one is especially handy—it increases damage against Sabers, which is one of the few classes that can easily break through her support defenses.

Playstyle and Combat Tips

Castoria is meant to be in the backline supporting others. She doesn’t deal huge damage herself, but her buffs make everyone else better. Use her NP early and often to keep buffs going and avoid getting hit by enemy NP removal effects.

In boss fights, stagger her invincibility with another defensive skill to prevent overlap. In farming stages, time her buffs so your DPS gets max value from each NP chain.

Artoria Caster is more than just another version of Artoria. She’s a top-tier support who redefined how players approach combat in Fate/Grand Order. Whether you’re farming or facing a high-difficulty challenge, Castoria is always a welcome addition to your team.

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