Fish It Rainbow Comet Shark Guide (March 2026) Rarest Secret Fish

Updated by Soumya Thakur
February 12, 2026
RobloxGaming

Are you ready to tackle Fish It’s most challenging catch? The Rainbow Comet Shark is the crown jewel of the Lava Basin Expansion, a Secret-rarity fish with an astonishing 1 in 5,000,000 catch rate that has even the most experienced players scratching their heads. As someone who has spent countless hours hunting this elusive creature, I’m here to share everything you need to know to add this magnificent specimen to your collection.

Quick Overview: Rainbow Comet Shark Essentials

Aspect	Details	Requirements
Rarity	Secret	1 in 5,000,000 catch rate
Location	Lava Basin	Kohana Volcano access required
Availability	Limited	Leaves February 21, 2026
Best Rod	Diamond Rod	1,300% Luck base
Best Bait	Aethereion Bait	+500% Luck bonus
Required Quests	Multiple	Hazmat Suit + Lava Basin unlock

Understanding the Rainbow Comet Shark

The Rainbow Comet Shark represents the pinnacle of Fish It’s fishing challenges. Introduced in the Lava Basin Expansion update (February 8, 2026), this magnificent creature features stunning rainbow colors that shimmer as it swims through the molten lava of Kohana Volcano’s most exclusive area. What makes this fish particularly special is not just its extreme rarity, but also its limited-time availability – this Secret fish will disappear from the Lava Basin on February 21, 2026, making your hunting window incredibly precious.

Step 1: Unlocking Access to Lava Basin

Prerequisite: Complete the Hazmat Suit Quest

Before you can even think about hunting the Rainbow Comet Shark, you’ll need to complete the “Suited Up” quest to obtain the Hazmat Suit. This essential gear protects you from the extreme heat of Kohana Volcano’s deeper areas.

Hazmat Suit Quest Requirements:

Catch 1,000 Magma or Lava Fish
Earn 2,000,000 Coins
Complete the quest at Kohana Volcano

Pro Tip: Focus on catching Magma Fish during the Volcano Event (occurs every 4 hours) when lava-boosted zones appear across the island. These zones significantly increase your catch rates and help you complete this quest much faster.

Unlocking the Lava Basin

Once you have your Hazmat Suit, follow these steps:

Navigate to Volcanic Cavern – Use your Hazmat Suit to access this end-game area
Find the Magma Fisherman – Look for the NPC standing next to a massive door
Complete the Lava Basin Quest – Requirements include:
- Catch the Mythic Blueflame Ray (1 in 120,000 catch rate)
- Use 2 Magma Charms (20,000 Coins each from Kohana Volcano shop)

For a complete walkthrough of the Lava Basin unlocking process, check out our Ultimate Fish It Lava Basin Quest Guide.

Step 2: Optimal Gear Setup for Maximum Success

Best Rod Configuration

The Diamond Rod stands as the undisputed champion for Rainbow Comet Shark hunting, offering an impressive 1,300% base Luck. Here’s how to maximize its potential:

Primary Setup:

Diamond Rod (1,300% Luck)
Perfection Enchant (ensures perfect casts)
Leprechaun II Enchant (50% Luck boost)
Aethereion Bait (+500% Luck)

Alternative Setup:

Element Rod (slightly lower Luck but still viable)
Same enchants and bait as above

Essential Enchantments

For the best results, you’ll want these specific enchantments:

Enchantment	Effect	Why It’s Essential
Perfection	Perfect casts every time	Eliminates failed casts that waste time
Leprechaun II	+50% Luck boost	Significant increase to catch rates
Empowered I	Luck + Reel Speed	Good alternative if Leprechaun II unavailable

Ultimate Bait: Aethereion Bait

The Aethereion Bait is your secret weapon for Rainbow Comet Shark hunting. This end-game bait provides:

+500% Luck (massive boost to catch rates)
1.1x Mutation Chance (for potential rare variants)
1.1x Bonus Size (for larger catches)
1.1x Shiny Chance (for shiny variants)

How to Get Aethereion Bait:

Complete the “Crystalline Secrets” quest from the Ghastly Pirate in Crystal Depths
Requirements include owning Element Rod, Singularity Bait, and catching specific Secret fish
This bait is considered the best bobber in the game as of the Charms update

Step 3: Location and Strategy

Finding the Best Fishing Spots

The Rainbow Comet Shark spawns exclusively in the Lava Basin area of Kohana Volcano. Based on extensive testing and community reports, here are the optimal locations:

Prime Spots:

Near lava crystals in the central area
Active magma pools in the middle of Lava Basin
Closest to intense magma zones for maximum spawn rates

Pro Strategy: Don’t move around too frequently when farming. The Rainbow Comet Shark has a spawn ratio of about 1 in 5 within the Secret fish category in Lava Basin, so staying in one optimal spot increases your chances over time.

Timing and Event Strategies

Volcano Event Advantage:

Occurs every 4 hours at Kohana Volcano
Creates lava-boosted zones with increased luck
These zones are randomized but worth hunting for
Duration is limited, so act quickly when they appear

Best Times to Fish:

During Volcano Events for boosted zones
Off-peak hours when server population is lower (less competition)
Extended sessions (2-4 hours minimum) for statistical advantage

Step 4: Advanced Hunting Techniques

The Persistence Method

Given the 1 in 5,000,000 catch rate, patience is your greatest ally. Here’s my proven approach:

Set up in your chosen spot with optimal gear
Fish continuously for 2-4 hour sessions
Track your casts (aim for 1,000+ casts per session)
Take breaks to maintain focus and avoid burnout
Return during Volcano Events for boosted luck periods

Community Coordination

Server Hopping Strategy:

Join during Volcano Event spawn times
Move to less populated servers for better spot availability
Coordinate with friends or Discord communities to share information about active lava zones

Luck Maximization Techniques

Stacking Luck Bonuses:

Diamond Rod (1,300%)
Perfection Enchant (perfect casts)
Leprechaun II Enchant (+50%)
Aethereion Bait (+500%)
Volcano Event zones (additional boost)
Potential luck potions (if available)

This setup can potentially push your effective luck to over 2,000% during optimal conditions.

Step 5: Common Mistakes to Avoid

Gear Misconceptions

Many players make these critical errors:

❌ Using inadequate rods – Basic rods simply won’t cut it for Secret fish ❌ Skipping enchantments – Perfection and Leprechaun II are essential ❌ Wrong bait selection – Standard bait won’t provide the luck needed ❌ Not having Hazmat Suit – You can’t even access the area without it

Strategy Pitfalls

Location Errors:

Fishing in wrong areas of Lava Basin
Moving too frequently between spots
Not targeting active magma zones

Timing Mistakes:

Ignoring Volcano Event schedules
Short fishing sessions (statistical disadvantage)
Not preparing for the limited availability (ends Feb 21, 2026)

Step 6: Preparation Checklist

Before You Start Hunting

Required Items:

Diamond Rod (fully enchanted)
Aethereion Bait (multiple stacks)
Hazmat Suit (equipped)
2,000,000+ Coins (for emergencies and supplies)
Magma Charms (if needed for quest completion)

Quest Completion Status:

Hazmat Suit quest completed
Lava Basin access unlocked
Blueflame Ray caught (for quest)

Optimal Setup Configuration

text

Rod: Diamond Rod

Enchant 1: Perfection

Enchant 2: Leprechaun II

Bait: Aethereion Bait

Location: Lava Basin central magma zone

Time: During Volcano Event (if possible)

Step 7: Understanding the Rarity System

Secret Fish Context

The Rainbow Comet Shark belongs to the Secret rarity tier, the highest in Fish It’s seven-tier system:

Common (1 in 2-25)
Uncommon (1 in 50-150)
Rare (1 in 300-750)
Epic (1 in 1,000-4,500)
Legendary (1 in 5,000-25,000)
Mythic (1 in 120,000)
Secret (1 in 5,000,000) ← Rainbow Comet Shark

Statistical Reality

With a 1 in 5,000,000 catch rate, here’s what to expect:

Average player: 1 catch every 2,000+ hours of optimal fishing
Lucky player: Might catch it in 500-1,000 hours
Extremely lucky: Could catch it in 100-200 hours
Most players: Will need thousands of attempts over multiple sessions

Step 8: Community Resources and Updates

Official Sources

Stay updated through these channels:

Official Twitter: @FishitROBLOX
Discord Server: Community tips and event notifications
Game Wiki: For updated information and community strategies

Frequently Asked Questions

How long does it take to catch Rainbow Comet Shark?

Based on community data and the 1 in 5,000,000 catch rate, most players need 1,000-5,000+ casts with optimal gear. This translates to 50-200+ hours of dedicated fishing time, though luck plays a significant role.

Can you catch Rainbow Comet Shark without Diamond Rod?

While technically possible, your chances are extremely low without optimal gear. The Diamond Rod’s 1,300% Luck base is crucial for making this catch feasible within a reasonable timeframe.

Is Rainbow Comet Shark worth the effort?

Absolutely! Beyond its rarity and limited availability, Secret fish like the Rainbow Comet Shark represent the pinnacle of Fish It achievement. Plus, with its departure date of February 21, 2026, missing this window means waiting for potential future re-releases.

What happens if you don’t catch it before February 21, 2026?

The Rainbow Comet Shark will leave the Lava Basin permanently on this date. While developers may bring it back in future events, there’s no guarantee. This makes the current hunting period especially valuable.

Can you trade for Rainbow Comet Shark?

No, Secret fish like the Rainbow Comet Shark cannot be obtained through trading. They must be caught personally through fishing in the designated area.

Final Thoughts

The Rainbow Comet Shark represents everything that makes Fish It an engaging and challenging experience. Its extreme rarity, limited availability, and the preparation required create a truly rewarding hunting experience for dedicated players.

Remember, success in catching this magnificent creature comes down to three key factors:

Preparation – Having the right gear and completing all prerequisites
Persistence – Committing to long fishing sessions with optimal setup
Luck – Embracing the statistical challenge and enjoying the journey

Whether you catch the Rainbow Comet Shark or not, the skills and knowledge gained during this hunt will serve you well throughout your Fish It journey. And who knows? With the right combination of preparation and luck, you might just be the next player to add this legendary creature to your collection.

Happy fishing, and may the odds be ever in your favor!