The Ultimate 2025 GBF Celestial Weapon Farm Guide: 5 Must-Know Strategies For Maximum Efficiency

As of December 2025, the grind for Celestial Weapons (極星器 / Polar Star) in Granblue Fantasy remains one of the most critical, yet demanding, mid-to-late-game farming objectives. These powerful weapons, introduced in the Unite and Fight (Guild War) event, offer a massive 10% Triple Attack (TA) boost to characters matching their specific weapon proficiency, making them an indispensable component for maximizing damage and utility in end-game grids like the Ultima and Omega Rebirth Wave 3 setups. This guide breaks down the absolute freshest and most efficient strategies for acquiring these game-changing items during the current event rotations. The Celestial Weapon grind is exclusively tied to the recurring Unite and Fight event, making it a time-gated resource that demands focused farming. Unlike older systems, the current meta has clearly defined the fastest and most reliable acquisition methods, prioritizing time-efficiency over raw drop rate boosts in higher-level content. Mastering the Nightmare (NM) fights is the key to minimizing your grind time and maximizing your *Crystallized Core* haul.

Celestial Weapon Acquisition: Drop vs. Trade and NM90 Dominance

There are two primary ways to obtain a Celestial Weapon (CW) in Granblue Fantasy, and understanding their balance is crucial for an efficient farm.

1. The Rare Drop Method (The RNG Route)

The most straightforward, yet often frustrating, method is as a rare drop directly from the Unite and Fight Nightmare bosses.

• Optimal Target: The Nightmare 90 (NM90) difficulty is overwhelmingly the most time-efficient node to farm Celestial Weapons.
• Efficiency over Drop Rate: While higher-level NMs (like NM95 or NM200) might have a marginal increase in drop rate, the time saved by quickly clearing NM90 repeatedly far outweighs the minimal benefit of the harder raids.
• Drop Rate Boosts: To mitigate the notoriously low drop rate, always utilize drop rate-boosting summons and characters. Kaguya (main or support summon), Premium Pass buffs, and Bounty Hunter skills are essential for maximizing your chances per run.

2. The Treasure Trade Method (The Pity Route)

This is the guaranteed method, which acts as a "pity" system for players with bad luck. You can trade 15 Crystallized Cores in the Treasure Trade shop for one Celestial Weapon of your choice.

• Crystallized Cores: These cores are the primary currency and reliable measure of your farm progress. They drop consistently from all Nightmare difficulties and are the true bottleneck for guaranteed acquisition.
• Farming Strategy: Your entire farming goal during Unite and Fight should be focused on clearing NM90 as fast as possible to accumulate cores and maximize your chances of a rare drop simultaneously.
• Trade Location: The Celestial Weapons can be found in the Treasure Trade shop under the path: *Weapons → Events → Celestial Weapons*.

Top 3 Celestial Weapon Priority List for 2025

Not all Celestial Weapons are created equal. Due to their unique 10% TA main-hand skill and the overall utility they provide to specific classes and grids, a clear priority list has emerged in the current meta. Focusing your initial trades and drops on these weapons will offer the biggest power spike.

1. Altruism-Soul Staff (Staff)

The Altruism-Soul Staff is arguably the highest priority for its incredible utility and synergy with top-tier characters and classes.

• Class Synergy: Excellent main-hand for Staff-proficient classes, especially the Sage and Relic Buster (with specific setups) for their healing and utility.
• Key Utility: The Staff proficiency is shared by many of the best support and utility characters in the game, making the 10% TA boost a foundational piece for full auto (FA) and high-difficulty content.

2. Gateway-Star Sword (Sword)

The Gateway-Star Sword is a close second, primarily due to the ubiquitous nature of the Sword proficiency.

• Class Synergy: A fantastic main-hand for Glorybringer and Kengo (in certain elements), offering a strong damage-focused option.
• Grid Flexibility: Swords are the most common weapon proficiency, meaning this CW slots easily into a massive number of grids and team compositions, including those utilizing the *Lof Resonator*.

3. Twinpain-Wolf Gun (Gun) and Golden Fists of Ura (Melee)

These two round out the top tier, offering specialized and general-purpose power, respectively.

• Twinpain-Wolf Gun: Highly valued for its synergy with Gun-proficient attackers and the Runeslayer class, offering aggressive setups.
• Golden Fists of Ura (Melee): Considered an all-around excellent weapon regardless of the element. Its utility for Melee-proficient characters makes it a strong contender for any player looking to boost their fist-users.

The Celestial Weapon Upgrade Bottleneck

Acquiring the first copy of a Celestial Weapon is only the beginning of the journey. The true long-term grind involves uncapping and transcending them, which is a significant resource sink, even for veteran players.

Uncapping and Rusted Weapons

The process of uncapping Celestial Weapons follows a similar path to the older Revenant weapons and Eternals.

1. You must first obtain a Rusted Weapon of the corresponding type (e.g., Rusted Staff for Altruism-Soul Staff).
2. The Rusted Weapon must be upgraded and element-changed to the desired element of your Celestial Weapon.
3. This element-changed Rusted Weapon is then used as a crucial material in the final uncap process.

The initial uncap requires a substantial amount of common materials, while later uncaps introduce event-specific items that can quickly deplete your stocks of Low Orbs, Whorls, and various scales.

The New Grind: Post-Uncap Materials

Recent updates have introduced new layers to the Celestial Weapon grind, with high-level uncaps requiring unique and scarce event materials. Discussions in the community highlight that even players who farm Unite and Fight extensively may struggle to gather the necessary resources to fully upgrade their Celestial Weapons, making the uncap materials themselves the new, difficult bottleneck. Prioritizing which CW to fully uncap is a major decision that requires looking at your current Grandblue Fantasy grid and your roster of Water Staff team or Dirt Glorybringer characters.

5 Essential Strategies for an Optimized Celestial Farm

To ensure you are not wasting AP or time, implement these five key strategies during every Unite and Fight event.

1. Target the NM90 One-Turn Kill (OTK)

Your single most important goal is to establish a reliable One-Turn Kill (OTK) or a very fast full-auto setup for the NM90 boss. Since the drop rate difference between NM90 and higher difficulties is minor, the speed of the clear is the dominant factor in farming efficiency. Focus on setups that are consistent and require minimal player input.

2. Maximize Bounty and Drop Rate

Always run a setup that includes a Bounty effect, typically through the skill *Bounty Hunter* or the summon Kaguya. Even a small increase in the drop chance for a rare item like the Celestial Weapon, or the guaranteed Crystallized Cores, translates to huge time savings over hundreds of runs.

3. Prioritize Your First Trade

Your first Celestial Weapon should almost always be a Staff or Sword due to their universal utility and synergy with meta classes. Use your first 15 *Crystallized Cores* to secure the *Altruism-Soul Staff* if you have a strong Staff-proficient team (e.g., *Cagliostro*, *Clarisse*, *Europa*), or the *Gateway-Star Sword* otherwise.

4. Don't Neglect Meat Farming

Celestial Weapon farming is gated by Meat, the resource used to summon the Nightmare bosses. Dedicate time to efficient EX+ or NM farming to maintain a healthy stock of Meat, ensuring you can chain-run the NM90 boss without interruption.

5. Prepare Uncap Materials in Advance

Since the uncap materials are a major bottleneck, use the downtime between Unite and Fight events to pre-farm Rusted Weapons from *Angel Halo* and stock up on generic materials like Low Orbs and Whorls. This foresight allows you to immediately uncap your newly acquired Celestial Weapons once the event is over.

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