Abyss Marcus Quests Guide (March 2026) Complete Walkthrough & Rewards
Welcome to the most comprehensive Abyss Marcus Quests Guide available! As an experienced Abyss player who has completed Marcus’s entire quest chain multiple times, I’ll walk you through every step, share pro tips, and help you maximize your rewards. Whether you’re just starting your journey in Ancient Sands or looking to optimize your quest completion, this guide has everything you need.
| Quest | Location | Difficulty | Est. Time | Key Rewards |
|---|---|---|---|---|
| Quest 1 | Ancient Sands | Easy | 10-15 min | $1000, 5 Star Shards, Small Oxygen Pod |
| Quest 2 | Ancient Sands | Easy | 15-20 min | $1600, 5 Star Shards, 2x Small Oxygen Pod |
| Quest 3 | Ancient Sands | Medium | 20-30 min | $2450, 10 Star Shards, Basic Oxygen Pod, Cactus Geode |
| Quest 4 | Ancient Sands | Medium | 30-45 min | $3850, 10 Star Shards, 2x Basic Oxygen Pod, Speed Potion |
| Quest 5 | Ancient Sands | Hard | 45-60 min | $4450, 15 Star Shards, 4x Small Oxygen Pod, Drop Luck Potion |
| Quest 6 | Ancient Sands | Hard | 60-90 min | $7800, 15 Star Shards, 4x Basic Oxygen Pod, XP Potion, Burger |
Who is Marcus in Abyss Roblox?
Marcus is one of the key quest NPCs located in the Ancient Sands region of Abyss Roblox. He’s a merchant who not only provides an extensive quest chain but also sells the valuable Crossbow Gun and Boat Tube – essential equipment for progressing through Ancient Sands.
Location Details:
- Region: Ancient Sands
- Exact Location: Archaeological site at Ancient Sands, before the big rock arch
- How to Reach: Swim west from the Forbidden Dome to Ancient Sands
- Prerequisites: At least Pufferfish Tube and Oxygen Tanks
- Shop Items: Crossbow Gun, Boat Tube
Marcus Quest 1: Getting Started
Quest Objectives:
- Catch 6 Pompano Fish
- Find 1 Sand-Mutated Fish
Recommended Equipment:
- Tube: Boat Tube
- Weapon: Crossbow Gun
Step-by-Step Guide:
- Purchase Essential Gear: Before starting, make sure you have the Boat Tube and Crossbow Gun from Marcus’s shop. These are crucial for efficient farming in Ancient Sands.
- Buy the Radar: Visit Richard in the Forgotten Dome to purchase the Radar. This tool is invaluable for identifying fish and their mutations, making your quest completion much faster.
- Locate Pompano Fish: Pompano are abundant in the shallow waters of Ancient Sands. They’re relatively easy to catch and don’t require much power from your weapon.
- Find Sand-Mutated Fish: Use your Radar to identify Sand-Mutated Fish. These appear randomly among regular fish and have a distinctive sandy appearance.
Pro Tips:
- Save your Oxygen by staying in shallower waters for this quest
- Focus on areas with multiple fish spawns to maximize efficiency
- The Radar will show mutations as colored outlines – sand mutations appear brownish
Rewards:
- $1000
- 5 Star Shards
- Small Oxygen Pod x1
Marcus Quest 2: Stepping Up
Quest Objectives:
- Catch 6 Cod
- Find 2 Sand-Mutated Fish
- Bring 1 Fish Bone
Recommended Equipment:
- Tube: Boat Tube
- Weapon: Crossbow Gun
Step-by-Step Guide:
- Target Cod Fishing: Cod are abundant and relatively easy to catch in Ancient Sands. They don’t require much power, making them perfect for this stage.
- Collect Fish Bones: During the fishing minigame, treasure chests will pop up. Make sure to collect these as they contain Fish Bones, which are required for this quest.
- Continue Sand Mutation Hunting: Use your Radar to find 2 more Sand-Mutated Fish. They should be easier to spot now that you’re familiar with their appearance.
Advanced Strategy:
- Create a fishing pattern that covers both shallow and slightly deeper waters
- Prioritize collecting treasure chests during fishing minigames
- Keep track of which areas have higher sand mutation spawn rates
Rewards:
- $1600
- 5 Star Shards
- Small Oxygen Pod x2
Marcus Quest 3: The Multi-Species Challenge
Quest Objectives:
- Catch 3 Blackfin Tuna
- Catch 4 Cod
- Catch 5 Pompano
- Find 1 Cactus-Mutated Fish
Recommended Equipment:
- Tube: Boat Tube
- Weapon: Crossbow Gun
Step-by-Step Guide:
- Diversify Your Fishing: This quest requires catching three different fish species. Create a route that covers areas where all three spawn frequently.
- Hunt Cactus Mutations: Cactus-Mutated Fish are rarer than sand mutations. They have a distinctive green, spiky appearance and are typically found in areas with more vegetation.
- Oxygen Management: Since you’ll need to explore further out for Blackfin Tuna, ensure you have adequate oxygen supply.
Pro Tips:
- Blackfin Tuna are typically found in deeper waters
- Cactus mutations often spawn near rock formations or underwater vegetation
- Consider bringing extra Oxygen Pods for extended exploration
Rewards:
- $2450
- 10 Star Shards
- Basic Oxygen Pod x1
- Cactus Geode x1
Marcus Quest 4: The Treasure Hunter
Quest Objectives:
- Catch 6 Blackfin Tuna
- Catch 6 Pompano
- Find 3 Sand-Mutated Fish
- Bring 2 Fish Bones
- Crack 3 Cactus Geodes
- Find 10 Tier 1 Treasure Chests
Recommended Equipment:
- Tube: Boat Tube
- Weapon: Crossbow Gun
Step-by-Step Guide:
- Systematic Treasure Hunting: This quest requires finding 10 Tier 1 Treasure Chests. Create a systematic search pattern covering the entire Ancient Sands area.
- Geode Cracking: Cactus Geodes can be cracked open for rewards. Save the one from Quest 3 and find 2 more through exploration or treasure chests.
- Balanced Fishing: Focus on catching both Blackfin Tuna and Pompano while keeping an eye out for sand mutations and treasure.
Advanced Strategy:
- Map out treasure chest spawn locations for future quests
- Prioritize areas with high fish density for efficient farming
- Consider upgrading your equipment if you’re struggling with oxygen management
Rewards:
- $3850
- 10 Star Shards
- Basic Oxygen Pod x2
- Speed Potion x1
Marcus Quest 5: The Deep Dive
Quest Objectives:
- Catch 4 Grouper
- Catch 5 Blackfin Tuna
- Catch 6 Cod
- Find 2 Fossil-Mutated Fish
- Find 2 Tier 2 Treasure Chests
Recommended Equipment:
- Tube: Boat Tube
- Weapon: Crossbow Gun
Step-by-Step Guide:
- Target Grouper Locations: Grouper typically spawn further out in Ancient Sands where stronger fish like Scorpionfish and Sharks may be lurking.
- Hunt Fossil Mutations: Fossil-Mutated Fish have a distinctive rocky, ancient appearance. They’re rarer than previous mutations and require careful searching.
- Tier 2 Treasure Chests: These are typically found in deeper waters or more challenging locations than Tier 1 chests.
Essential Tips:
- Carry Oxygen Pods to refill your Oxygen when needed in deeper waters
- Be prepared for encounters with stronger fish species
- Fossil mutations often appear near rock formations or archaeological sites
Rewards:
- $4450
- 15 Star Shards
- Small Oxygen Pod x4
- Drop Luck Potion x1
Marcus Quest 6: The Final Challenge
Quest Objectives:
- Catch 4 Scorpionfish
- Catch 5 Grouper
- Catch 6 Blackfin Tuna
- Find 3 Cactus-Mutated Fish
- Find 2 Fossil-Mutated Fish
- Bring 6 Fish Bones
- Crack 5 Cactus Geodes
Recommended Equipment:
- Tube: Boat Tube
- Weapon: Wasted Gun (recommended upgrade from Crazy Jeff’s Shop)
Step-by-Step Guide:
- Upgrade Your Weapon: It’s highly recommended to get the Wasted Gun from Crazy Jeff’s Shop to comfortably farm Scorpionfish and other stronger fish.
- Advanced Mutation Hunting: This quest requires finding multiple rare mutations across different types.
- Resource Management: You’ll need significant amounts of Fish Bones and Cactus Geodes, so plan your resource collection carefully.
Expert Strategy:
- Create an efficient route covering all necessary fish spawn points
- Save resources from previous quests when possible
- Consider using potions to boost your efficiency
- Master the fishing minigame for maximum treasure chest collection
Rewards:
- $7800
- 15 Star Shards
- Basic Oxygen Pod x4
- XP Potion x1
- Cactus Geode x1
- Burger x1
Essential Preparation Tips
Before Starting Marcus’s Quests:
- Get the Radar: Purchase from Richard in the Forgotten Dome – this is non-negotiable for efficient mutation hunting.
- Stock Up on Oxygen: Bring multiple Oxygen Pods, especially for later quests.
- Upgrade Equipment: While the Boat Tube and Crossbow Gun can get you through early quests, consider upgrades for later challenges.
- Learn Fish Patterns: Each fish species has preferred spawn locations and behaviors.
Recommended Progression Path:
- Complete Quests 1-2 to build basic resources and confidence
- Upgrade Equipment before attempting Quest 3
- Master Treasure Hunting during Quest 4 for future benefits
- Prepare for Deep Waters before starting Quest 5
- Get Wasted Gun before attempting Quest 6
Common Mistakes to Avoid
Beginner Mistakes:
- Not buying the Radar first
- Ignoring treasure chests during fishing
- Poor oxygen management
- Not upgrading equipment between quests
Advanced Mistakes:
- Wasting resources on inefficient routes
- Not saving mutations for future quests
- Underestimating the difficulty jump in later quests
- Forgetting to stock up on consumables
Pro Strategies for Speed Running
Optimization Tips:
- Create Efficient Routes: Map out the most efficient path covering all required fish spawn points
- Batch Similar Objectives: Complete multiple objectives in the same area when possible
- Master the Fishing Minigame: Perfect your timing for maximum treasure chest rewards
- Use Potions Strategically: Save speed and luck potions for the most challenging quests
Resource Management:
- Save Fish Bones and Geodes from earlier quests
- Don’t sell all your fish immediately – some might be needed for mutations
- Keep backup Oxygen Pods for emergencies
Frequently Asked Questions
Q: How do I find Marcus in Abyss Roblox?
A: Marcus is located in the Ancient Sands region, specifically at the archaeological site before the big rock arch. You’ll need at least a Pufferfish Tube and Oxygen Tanks to reach him from the Forbidden Dome.
Q: What’s the best equipment for Marcus’s quests?
A: Start with the Boat Tube and Crossbow Gun from Marcus’s shop. For later quests, especially Quest 6, upgrade to the Wasted Gun from Crazy Jeff’s Shop.
Q: How do I identify mutated fish?
A: Purchase the Radar from Richard in the Forbidden Dome. It will show fish mutations as colored outlines – sand mutations appear brownish, cactus mutations green, and fossil mutations rocky.
Q: Are Marcus’s quests repeatable?
A: No, Marcus’s quest chain can only be completed once per character. However, the rewards and progression benefits are permanent.
Q: What’s the total reward for completing all Marcus quests?
A: You’ll receive a total of $21,150, 65 Star Shards, various Oxygen Pods, potions, and other valuable items across all six quests.
Q: Can I complete Marcus’s quests with friends?
A: Yes, you can complete quests with friends, which can make finding certain fish and treasure chests easier. However, each player needs to complete their own quest objectives.
Final Thoughts
Marcus’s quest chain is one of the most comprehensive and rewarding progression paths in Abyss Roblox. By following this guide, you’ll not only complete all quests efficiently but also gain valuable resources and experience for your journey through the depths.
Remember to bookmark this guide and check back regularly for updates, as Abyss is constantly evolving with new content and balance changes. The game received its latest major update on December 12, 2026, bringing various bug fixes and quality of life improvements that may affect quest strategies.
Happy fishing, and may your mutations be ever in your favor! Don’t forget to join the official Abyss Discord for the latest community tips and updates.
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