The First Descendant Bunny Build Using Cooldown + Singular Reactor

 


🟩 Introduction

Bunny is one of the fastest and most energy-intensive characters in The First Descendant, and getting the right build can completely change how you play. With the latest update and some hands-on testing, we’ve developed a highly efficient Bunny setup using a Cooldown + Singular Reactor, backed by Mutant Cells. The main focus? Maintaining high MP for continuous ability usage—especially your second skill—for extended runs, even in low-MP environments like the Sigma Sector.

This guide covers everything you need to recreate the build—modules, components, arcade tuning, and more. If you're looking to optimize Bunny for speed and nonstop ability uptime without sacrificing damage or utility, you're in the right place.

🟩 Core Build Concept: High MP Sustain with Cooldown + Singular Reactor

The main idea behind this Bunny build is to keep your MP bar stable for as long as possible—especially when you're activating the second skill that consumes MP continuously. Most Bunny builds rely on enemy kills or pickups to recover MP, but this setup minimizes that dependency. By combining a Singular + Cooldown Reactor with carefully selected modules and mutant cell synergy, this build allows you to run and use skills for over 90 seconds—even without picking up MP or defeating enemies.

This is ideal for invasion dungeons or long corridor runs, where MP drops are rare. You’ll be able to maintain speed and damage output while avoiding interruptions to your flow. It’s not just about raw numbers; it’s about sustained mobility and consistency.



🟩 MP Regeneration Without Enemy Dependency

What makes this build stand out is how it integrates arcade tuning and component bonuses to passively regenerate MP over time. Using the Inversion Reinforcement node, you receive a chunk of MP every 45 seconds, regardless of combat. Additionally, the Neural Focus Augmentation grants MP boosts upon enemy kills—up to five stacks—giving you a burst of MP when you need it most.

In testing, even without actively seeking out MP drops or kills, the MP bar drains extremely slowly, allowing for continuous use of Bunny’s second skill over long stretches. This becomes especially useful during Sigma Sector runs, where enemies appear in waves and MP drops are limited between encounters.

🟩 Modules Overview: Balanced Power, Range, and Efficiency

The module layout is mostly consistent with traditional Bunny builds but with a few smart adjustments for MP efficiency and skill range. Here’s a breakdown of what’s used:

  • Nimble Fingers – Reduces skill cooldowns slightly.

  • Strong Mentality & Maximize Conservation – These two provide solid skill cost reduction, helping keep MP consumption in check.

  • Expansion & Control – Enhance range and slightly boost shield durability.

  • Singular Amplification & Electric Amplification – These enhance the power of your electric and singular-based abilities.

  • Power Increase – Ensures you don’t sacrifice damage while optimizing MP.

This combination strikes a solid balance. Even with cost-saving modules, you're still outputting strong electric skill damage and maintaining solid area coverage, making it ideal for farming or sustained enemy waves.



🟩 Reactor Choice: Cooldown and Singular for Full Uptime

One of the key shifts in this updated build is the choice of reactor type. By using a Cooldown + Singular Reactor, you gain more frequent access to abilities and extra power for singular-based attacks. What matters most here is syncing your third skill’s cooldown with its duration. You want to ensure that as one activation ends, you’re ready to use it again.

In this setup, the cooldown is approximately 18.3 seconds, while the skill lasts for 20 seconds, meaning you’ll always have the ability ready. This allows seamless usage during tougher waves or boss fights and adds another layer of sustained pressure in combat.

🟩 Arcade Tuning Setup: Max MP, Recovery, and Skill Power

The arcade tuning in this Bunny build is heavily optimized for MP sustain and skill efficiency. Instead of leaning heavily into cooldown reduction—which is already handled by your reactor and modules—the tuning focuses on maximum MP, MP recovery rate, and skill power nodes.

Here’s a quick summary of the arcade tuning choices:

  • Prioritize all nodes that offer MP increase and MP recovery.

  • Pick skill power nodes to maintain consistent damage output.

  • Ignore or sacrifice cooldown nodes, since your current cooldowns are already synced efficiently.

  • Choose range nodes where possible to maintain flexibility in targeting.

  • Avoid crit-based nodes; Bunny doesn’t rely on critical hits.

This approach allows your abilities—especially your second one—to stay active longer without running dry. It also means you’re not missing out on offensive strength, as skill power nodes ensure consistent impact.

🟩 Component Synergy: Mutant Cells + Armor Pieces

For components, this build uses a hybrid strategy. The goal is to combine MP efficiency, singular power, and skill cost reduction:

  • 2x Ascending Armory Pieces – Offers a 6.5% skill cost reduction bonus, contributing directly to MP sustain.

  • 2x Plague Memory Pieces – Adds 5% singular power, which stacks well with your reactor and arcade tuning.

In terms of stats, the build achieves:

  • Singular Power: Around 335

  • Skill Power: Around 656

  • Electric Skill Power: Approx. 854

These numbers exclude the quantum domain bonus, which gives an additional 9% skill power during combat. So, your real-time damage output will be even higher in practical scenarios.




🟩 Playstyle Tips: Sustain Movement and Smart Engagements

This Bunny build is best suited for players who rely on constant mobility, especially when using the second ability, which consumes MP rapidly. The high MP pool, paired with gradual regeneration, allows for long periods of uninterrupted movement. You’ll want to:

  • Activate your second ability and keep it going as long as possible.

  • Use third ability on cooldown; with the current setup, it will always be ready when needed.

  • Be mindful of 45-second intervals when the Inversion Reinforcement perk grants bonus MP.

  • During fights, build stacks of Neural Focus Augmentation by defeating enemies to push your max MP higher.

In dungeons or missions like Sigma Sector, where enemies spawn intermittently, this build keeps you moving fast even between combat. The low MP drain rate is particularly useful for these long stretches, letting you conserve energy until the next big engagement.

🟩 Perks and Utility: Picking the Right Add-ons

To further support MP sustain and survivability, a few selective perks are added:

  • Inversion Reinforcement – Grants a stackable MP boost after each enemy kill, up to five stacks.

  • Passive MP Recovery Perk – Activates every 45 seconds, even outside combat.

  • HP Support Perk – Optional, but adds minor durability if you need more survivability.

You can swap out the HP perk for something else depending on your content focus (solo vs co-op, raid vs farming), but for most players, this layout gives a well-rounded build with minimal tradeoffs.

🟩 Conclusion: Final Thoughts on the Cooldown + Singular Bunny Build

This updated Bunny build for The First Descendant focuses on maximizing MP efficiency while maintaining strong offensive capabilities. By prioritizing Mutant Cells, a Cooldown + Singular Reactor, and MP-friendly arcade tuning, you can run Bunny’s abilities nearly non-stop—even in low-drop areas like the Sigma Sector.

What makes this setup especially effective is how it balances mobility, damage, and resource management. You won’t need to rely on enemies or MP pickups to keep your speed active. Whether you're farming, completing dungeons, or grinding Sigma Sector, this Bunny build gives you consistency, reliability, and fun all rolled into one.




🟩 FAQs: Bunny Build Using Cooldown + Singular Reactor

Q: Why use a Cooldown + Singular Reactor instead of other types?
A: It lets your third ability stay active nearly all the time while boosting singular power damage output.

Q: Is this build viable for Sigma Sector or late-game missions?
A: Yes, it’s specifically optimized for long-duration runs where MP drops are rare and constant speed is essential.

Q: What are the best modules to use?
A: Strong Mentality, Maximize Conservation, Electric Amplification, and Power Increase offer the best mix of cost reduction and damage.

Q: Does this build sacrifice damage for utility?
A: No. You still maintain high skill power while extending ability uptime. It’s a balanced setup.

Q: How often do I get MP back?
A: Every 45 seconds passively and continuously through MP recovery stats. Enemy kills also grant MP via Inversion Reinforcement.


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