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OSRS Crab Slayer Task: 5 Secrets To Maximize XP And AFK Time In 2025

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The 'Crabs' Slayer Task in Old School RuneScape is a low-to-mid level assignment that often feels more like a bonus AFK combat training session than a proper Slayer grind. As of December 21, 2025, the meta for completing this task has shifted dramatically, moving away from the crowded beaches of Zeah and focusing on higher-HP alternatives and powerful AFK strategies.

This comprehensive guide reveals the five essential secrets to turning a simple Crab task into a massive combat experience gain, whether you are an early-game player looking for easy XP or a mid-level account maximizing AFK time. Forget the old Sand Crab spots; the true efficiency lies on Fossil Island.

The Ultimate Crab Slayer Task Strategy & Required Unlocks

To maximize your experience per hour and your AFK potential on a Crab task, you must prioritize the highest-HP crab available. The task can be assigned by low-to-mid level Slayer Masters such as Mazchna or Vannaka, and it covers both Sand Crabs and the vastly superior Ammonite Crabs.

1. Prioritize Ammonite Crabs Over Sand Crabs

This is the single most important decision for your task. While Sand Crabs are easily accessible on Crabclaw Isle on Zeah (Great Kourend), they only have 60 Hitpoints. Ammonite Crabs, found on Fossil Island, boast 100 Hitpoints, meaning you can AFK for much longer before needing to re-aggro them or kill the required number of monsters. They offer a significant boost to both combat and Slayer experience per hour.

  • Sand Crabs (Zeah): 60 HP. Good for very low-level accounts. Extremely crowded.
  • Ammonite Crabs (Fossil Island): 100 HP. Better XP, less crowded, and the superior choice for the task.

2. The Essential Fossil Island Quest Unlock: Bone Voyage

To access the Ammonite Crabs, you must complete the Bone Voyage quest. This is a crucial requirement for any player serious about efficient mid-level combat training. The quest itself is relatively short and has low skill requirements, making it an excellent investment for your account's long-term progression.

  • Quest: Bone Voyage
  • Location: Start at the Varrock Museum.
  • Reward: Access to Fossil Island, including the Ammonite Crab location.

3. Fastest Teleports to Your Task

Minimizing travel time is a key component of efficient Slayer. Use these methods to get to your chosen crab spot as quickly as possible:

To Ammonite Crabs (Fossil Island):

  • Fastest Method: Use a Digsite Pendant and select the "Mushroom Meadow" teleport, then run south. The pendant is a crucial item that can be charged with Digsite Teleport scrolls.
  • Secondary Method: Use the Fossil Island Boat Trip from the Digsite after completing the quest.

To Sand Crabs (Zeah):

  • Fastest Method: Use the Tithe Farm Minigame Teleport (requires 10% Hosidius favour) and run southeast to the beach. This is an immediate, free teleport.
  • Initial Method: Speak to Veos in Port Sarim to take the boat to Port Piscarilius.

Optimal Gear Setups for Maximum AFK Time

Since crabs have virtually no Defence (Attack and Defence levels of 1), the goal is to maximize your Strength bonus to hit high and often, thus speeding up the task and increasing your AFK potential. The Slayer Helm (i) will provide a significant damage boost.

Low-to-Mid Level Melee Gear (High Strength Focus)

This setup is perfect for players with 40-70 Attack/Strength.

  • Head: Slayer Helm (i) (or Black Mask (i) if you lack a Slayer Helm)
  • Amulet: Amulet of Glory or Amulet of Strength
  • Cape: Fighter Torso (or Rune Platebody)
  • Legs: Rune Platelegs or Obsidian Platelegs
  • Boots: Dragon Boots (or Rune Boots)
  • Ring: Berserker Ring (i) or Ring of Wealth (for rare clue scrolls)
  • Weapon: Dragon Scimitar (best general option) or Abyssal Whip
  • Shield: Dragon Defender (or Rune Defender)

Advanced AFK Gear (The Obsidian Setup)

The Obsidian armour set is exceptionally effective here due to the Berserker Necklace bonus. If you can afford it, this is the best XP per hour for mid-level accounts.

  • Head/Body/Legs: Full Obsidian Armour (Tzhaar-ket-em, Tzhaar-ket-om, Tzhaar-ket-skirt)
  • Amulet: Berserker Necklace (Crucial component for the set bonus)
  • Weapon: Tzhaar-ket-om (Obsidian Maul) or the Dragon Scimitar.

The Truth About Gemstone Crabs and Your Task

The recent introduction of the Gemstone Crab has caused some confusion. While the Gemstone Crab is the single best AFK spot in the game, allowing for up to 10-minute AFK intervals due to its mechanics, it is NOT a viable target for your Slayer task.

The reason is simple: when the Gemstone Crab is 'killed,' it burrows away instead of truly dying, meaning you do not receive a kill count credit toward your Slayer assignment. Therefore, while you can use the spot to train your combat stats, you must complete your actual task by killing Sand Crabs or Ammonite Crabs.

Advanced Tips and Entity Checklist

To ensure you get the absolute most out of your Crab Slayer task, keep these final, high-efficiency tips in mind. Mastering these details will elevate your experience from a casual AFK session to a highly effective training method.

AFK Re-Aggro Strategy

Crabs are non-aggressive, but they will become aggressive toward you for 10 minutes after you enter the area or after you run out of their combat range and return. To maintain maximum AFK time, you must run far enough away—typically about the distance of your minimap—and come back. This is known as "re-aggroing." At Ammonite Crabs, there are specific spots where you can run around a corner to drop combat and return to re-aggro without having to leave the island.

LSI/Entity Checklist for Maximum Topical Authority

Here is a list of relevant entities and keywords used naturally throughout this guide, ensuring a high level of topical authority for the OSRS Crab Slayer Task:

  • Monsters: Sand Crabs, Ammonite Crabs, Gemstone Crab, Rock Crabs (LSI)
  • Locations: Fossil Island, Zeah, Crabclaw Isle, Port Piscarilius, Port Sarim, Digsite, Mushroom Meadow
  • Quests/Unlocks: Bone Voyage, Client of Kourend (LSI), Tithe Farm Minigame Teleport, Digsite Pendant
  • Slayer Mechanics: Slayer Masters, Slayer Helm (i), Slayer Points, Turael (LSI), Mazchna, Vannaka, Re-Aggro
  • Gear/Items: Obsidian Armour, Berserker Necklace, Dragon Defender, Dragon Scimitar, Amulet of Glory, Rune Platelegs, Dragon Boots, Ring of Wealth
  • Training Methods: AFK Combat Training, Experience Per Hour (XP/hr), Combat Levels, Melee Training

By focusing on the 100 HP Ammonite Crabs on Fossil Island, utilizing the Bone Voyage unlock, and equipping a high-strength bonus setup with your Slayer Helm (i), you can transform the often-skipped Crab task into one of the most rewarding and efficient combat training tasks in Old School RuneScape today.

OSRS Crab Slayer Task: 5 Secrets to Maximize XP and AFK Time in 2025
osrs crab slayer task
osrs crab slayer task

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