How to Unlock Ruinous Oath Rod in Fisch Roblox (October 2025)

The Ruinous Oath is the ultimate Stage 10 fishing rod in Fisch Roblox, offering unmatched stats with 95% lure speed, 500% luck, and infinite max KG capacity. This legendary rod requires completing the Crimson Cavern bestiary and collecting 8 crystals, making it one of the most challenging but rewarding items to obtain in the game. This comprehensive guide will walk you through every step of unlocking this powerful rod, from keystones to crystal collection.

Quick Reference: Ruinous Oath Requirements

Requirement	Details
Cost	30,000,000 C$
Location	Crimson Cavern
Main Requirement	Complete Shiny Sparkling Crimson Cavern Bestiary
Additional Tasks	Collect 8 crystals, Complete "A Mutated Dragon" quest
Prerequisites	Access to Luminescent Cavern, Super Flippers, Water Bubble, Light sources

Ruinous Oath Rod Stats & Abilities (October 2025)

The Ruinous Oath stands as the pinnacle of fishing rods in Fisch, offering stats that dwarf all other rods:

• Lure Speed: 95%
• Luck: 500%
• Control: 0.08
• Resilience: 25%
• Max KG: Infinite
• Stage: 10

Special Passive Abilities

What truly sets the Ruinous Oath apart are its unique passive abilities:

• 5% chance for slashes that fills up 2% progress every 0.25 seconds
• Slash chances increase by 8% every second
• 25% chance for Luminescent (9x) multiplier
• Perfect Catch mechanics: Control bar gradually decreases while progress speed increases by 5% every second
• Chance to instantly fill almost the entire progress bar
• 100% chance for Mastered (16x) on perfect catches

These abilities make the Ruinous Oath exceptionally powerful for catching rare fish and completing bestiary entries efficiently.

Step 1: Preparation Before Starting

Before attempting to unlock the Ruinous Oath, ensure you have these essential items:

Essential Equipment

• Super Flippers - For faster swimming through underwater areas
• Water Bubble - Extends underwater time significantly
• Light Sources - Fairy lantern or ultra bright lantern for dark caverns
• Performance Mode - Enable higher brightness and saturation for better visibility

Recommended Items

• Shark Head bait - For catching Colossal Blue Dragon
• High-tier rods - No-Life Rod recommended for difficult catches
• Plenty of C$ - You'll need 30 million for the final purchase
• Friends/Team - Some challenges are easier with cooperation

Step 2: Unlocking Luminescent Cavern

The journey to Ruinous Oath begins with accessing Luminescent Cavern, which requires collecting three specific keystones from nine possible locations.

Understanding the Keystone System

Each player receives a unique combination of three keystones needed to unlock Luminescent Cavern. Visit the pedestals near the Red Buoy at Desolate Deep to discover which three you need.

All Keystone Locations & Coordinates

Keystone Name	Location	Coordinates	Specific Instructions
Cliff Keystone	Castaway Cliffs	473, 230, -2159	Small gap beside ledge to second level
Mushroom Keystone	Mushgrove Islands	2666, 130, -717	On top of boat near Alligator area
Fossil Keystone	Ancient Isles	6065, 225.5, 259.5	On wood heap lifted by cranes near merchant
Snowflake Keystone	Snowburrow	2788, 153.5, 2603	Inside cave beside pine tree
Volcano Keystone	Roslit Volcano	-1970, 175.4, 268	Middle stone inside volcano
Skull Keystone	Forsaken Shores	-2797.5, 209, 1544.2	Beside pirate NPC (map fixing area)
Lightning Keystone	Grand Reef	-3406, 134.2, 262.2	Small island left of Shipwright island
Turtle Keystone	Terrapin Island	57, 149.5, 2032	Inside Terrapin Hideaway
Sun Keystone	Sunstone Island	-935, 223, -984	Inside Merlin's Hut

Entering Luminescent Cavern

Once you have your three keystones:

• Start at Red Buoy - Dive underwater with proper gear
• Navigate to warning sign - Head straight from the buoy
• Find glowing blue coral - Take right turn here
• Locate Diver NPC - Another right turn leads to the pedestals
• Place keystones - Press 'E' to place each keystone on its pedestal
• Enter the crack - The wall opens to reveal Luminescent Cavern
• Cross Mysterious River - Final barrier before accessing the area

Step 3: Completing the "A Mutated Dragon" Quest

To access Crimson Cavern, you must complete the "A Mutated Dragon" quest by catching a Crimson Mutated Colossal Blue Dragon.

Finding Colossal Blue Dragon Hunts

• Location: Left side of Luminescent Cavern during active hunts
• Rarity: Exotic
• Preferred Bait: Shark Head
• Best Conditions: Clear weather, Spring/Summer seasons
• Weight: Average 200,000kg (base)

Catching Strategy

• Wait for hunt activation - These are timed events
• Use Shark Head bait - Increases catch rate significantly
• Prepare for challenge - Applies -90% Progress Speed when hooked
• Watch for visual cues - Shimmering sound and pop-up appear when hooked
• Team up if possible - Makes the difficult catch more manageable

Understanding Mutations

The Colossal Blue Dragon has multiple possible mutations, but you specifically need the Crimson mutation to unlock Crimson Cavern:

• Chaotic - Random mutation
• Mastered - Enhanced version
• Crimson - REQUIRED for Crimson Cavern access
• Blessed - Lucky mutation
• Silver - Rare metallic variant
• Big - Size enhancement
• Lunar - Moon-related mutation
• Hexed - Cursed variant
• Negative - Dark mutation
• Electric - Lightning-based
• Glossy - Shiny appearance
• Albino - White variant
• Mosaic - Pattern-based
• Luminescent - Glowing effect
• Scorched - Fire-related
• Translucent - Semi-transparent
• Serene - Peaceful variant
• Frozen - Ice-based
• Spirit - Ethereal version
• Shiny - Enhanced appearance

Step 4: Accessing Crimson Cavern

Once you have the Crimson Mutated Colossal Blue Dragon:

• Return to quest NPC - Located in Luminescent Cavern
• Deliver the dragon - Completes the "A Mutated Dragon" quest
• Crimson Cavern unlocks - The gate opens to the new area
• Enter Crimson Cavern - A crimson jungle with glowing fungi and red waterfalls

Crimson Cavern Features

• Environment: Lush crimson jungle with giant glowing fungi
• Notable Landmarks: Giant tree with Crimson King's throne
• NPCs: Crimson King, Wixie, Tilli
• Special Features: Crab Cage available, no Bait Crate

Step 5: Completing Crimson Cavern Bestiary

The most time-consuming requirement for the Ruinous Oath is completing the full Shiny Sparkling Bestiary in Crimson Cavern.

Crimson Cavern Fish Species

Fish Name	Rarity	Special Notes
Red Spotted Blenny	Uncommon	Day time preferred
Sea Raven	Rare	Clear weather best
Red Crabsquid	Unusual	Night fishing effective
Viperfish	Rare	Pro tip: Use No-Life rod with no bait at night
Red Fangtooth	Legendary	Requires high-tier equipment
Japanese Dragon Eel	Mythical	Very rare, patience needed
Vampire Squid	Exotic	Hunt events only
Lithodes Megacantha	Relic	Extremely rare mutation
Colossal Ancient Dragon	Apex	Boss-level difficulty

Bestiary Completion Strategy

• Start with common fish - Build momentum with easier catches
• Use appropriate bait - Each fish has preferred bait types
• Fish at optimal times - Weather and season affect spawn rates
• Focus on one species at a time - More efficient than random fishing
• Use Ruinous Oath passive abilities - Once obtained, helps with remaining catches
• Join fishing communities - Learn from others' experiences

Understanding Shiny Sparkling Requirements

• Shiny chance: 3% (nerfed from 5% in update 1.50.0)
• Sparkling chance: Separate from shiny, both required
• Strategy: Fish in large quantities to maximize chances
• Patience needed: This is the most time-consuming part of the process

Step 6: Collecting the 8 Crystals

After completing the bestiary, you'll need to collect 8 crystals scattered throughout Crimson Cavern.

Crystal Collection Quest

This quest is given by an NPC in Crimson Cavern (likely Wixie based on community references):

• Talk to the crystal NPC - Receive the crystal collection quest
• Explore thoroughly - Crystals are hidden in various locations
• Use bright lantern - Essential for spotting crystals in dark areas
• Systematic search - Check all corners, caves, and high places
• Work with friends - Makes collection faster and more enjoyable

Pro Tips for Crystal Hunting

• Brightness settings: Maximize visibility
• Team coordination: Split up to cover more area
• Reference guides: Community maps may help (though locations may vary)
• Persistence: Some crystals are well-hidden

Step 7: Purchasing the Ruinous Oath

After completing all requirements:

• Verify completion - Ensure bestiary is 100% Shiny Sparkling
• Collect all 8 crystals - Turn in the crystal quest
• Visit the Crimson Cavern vendor - Located near the giant tree
• Purchase Ruinous Oath - Cost: 30,000,000 C$
• Equip and enjoy - You now have the best rod in the game!

Advanced Strategies & Pro Tips In 2025

Maximizing Efficiency

1. Use the Ruinous Oath strategically - Its passive abilities make it ideal for:
   • Catching rare fish for other bestiaries
   • Farming high-value fish
   • Completing challenging hunts
   • Helping friends with their catches
2. Enchantment recommendations - Based on community testing:
   • Luck-enhancing enchantments
   • Lure speed improvements
   • Control bar adjustments
3. Bait optimization - Pair with highest-tier bait for maximum effectiveness

Common Mistakes to Avoid

1. Skipping preparation - Don't enter caverns without proper gear
2. Ignoring keystone order - Place keystones in the correct pedestals
3. Underestimating bestiary time - This takes significantly longer than other steps
4. Poor mutation management - Focus specifically on Crimson mutation
5. Insufficient funds - Ensure you have 30 million C$ before final step

Frequently Asked Questions

How long does it take to get the Ruinous Oath?

The process typically takes 20-40 hours, with the majority of time spent completing the Crimson Cavern bestiary. The crystal collection and other quests are relatively quick in comparison.

What's the best rod to use before getting Ruinous Oath?

The No-Life Rod is highly recommended for difficult catches like the Viperfish and Colossal Blue Dragon due to its high control and resilience stats.

Can I complete the Crimson Cavern bestiary without Ruinous Oath?

Yes, but it's significantly more difficult and time-consuming. Many players complete the bestiary first, then purchase Ruinous Oath to help with other areas of the game.

Are the crystal locations the same for everyone?

Crystal locations appear to be consistent, but some randomness may be involved. Working with systematic search methods is most effective.

What happens if I lose my Crimson Mutated Colossal Blue Dragon?

You'll need to participate in another Colossal Blue Dragon hunt and try again for the Crimson mutation. The mutation is random, so persistence is key.

Is the Ruinous Oath worth the effort?

Absolutely. With 500% luck, infinite max KG, and unique passive abilities, the Ruinous Oath dramatically improves your fishing efficiency and is considered the best rod in the game.

Can I help friends get their Ruinous Oath?

Yes, many of the challenges (especially crystal collection and dragon hunts) are easier with friends. However, each player must complete their own bestiary and purchase their own rod.

What's the difference between Shiny and Sparkling?

These are separate rarity modifiers for fish. Both must be obtained for each species to complete the Shiny Sparkling bestiary requirement.

Conclusion

The Ruinous Oath represents the pinnacle of achievement in Fisch Roblox, offering unparalleled power and utility for dedicated players. While the journey is long and challenging, the reward of wielding this Stage 10 rod with its incredible stats and unique abilities makes every effort worthwhile.

From navigating the keystone system to mastering the art of catching rare mutations, each step of this guide has prepared you for the ultimate fishing rod acquisition. Remember to prepare properly, work systematically, and don't hesitate to join the community for support and additional strategies.

As you embark on this epic fishing adventure, keep in mind that patience and persistence are your greatest allies. The Ruinous Oath isn't just a rod—it's a testament to your dedication and skill as a master angler in the world of Fisch.

Ready to begin your journey to the Ruinous Oath? Bookmark this guide, gather your equipment, and dive into the mysterious caverns of Fisch. The ultimate fishing rod awaits those brave enough to claim it!