New OSRS Delve Boss: Doom of Mokhaiotl (2025 Update)

Old School RuneScape has just dropped a massive PvM update featuring the Delve mechanic and a powerful new boss: Doom of Mokhaiotl. In this guide, we’ll break down every part of the update, including the new melee spec weapon, slayer monster, gem crab, and how to make serious GP from this content.

If you’re skipping the grind and want quick GP to gear up for Delve, buy OSRS gold directly from HeeraGold.

New Melee Spec Weapon: Mokhaiotl’s Fang

The new weapon is a 2-handed melee spear called Mokhaiotl’s Fang. It features a special attack that deals guaranteed poison damage and ignores defensive prayers. While its DPS isn’t better than the Ghrazi rapier for standard PvM, it’s highly effective in Delve encounters and PvP scenarios.

  • Special Attack: 50% energy, guaranteed venom hit
  • Tradeable on GE — early prices: 25–30M

Gem Crab: New Utility NPC

Found near the Delve entrance, the Gem Crab lets you trade Delve drops for new resources like spirit shards, which are used in fletching and crafting upgrades. It’s also involved in charging the Fang’s special effects.

  • Drop trade-in rates are variable
  • Can be used to unlock cosmetic upgrades

New Slayer Monster: Mokhaiotl’s Acolyte

A brand-new slayer creature required to access the Delve boss area. They drop the necessary Delve Tokens and unique charms that boost loot from Mokhaiotl.

  • Required Slayer Level: 88+
  • High HP, but safe-spotable with ranged

Fletching Activity & Rewards

By collecting Enchanted Bark and Spirit Dust, players can craft new Delve Bolts and Venom-Tipped Arrows. These are BIS for PvM in the Mokhaiotl chamber and fetch a premium on the GE.

  • XP Rates: 80–100k/hr
  • Profit Potential: 300k–800k/hr

Delve Boss: Doom of Mokhaiotl

This is the highlight of the update. Doom of Mokhaiotl is a Delve-exclusive multi-phase encounter with mechanics similar to a solo Raids boss. You must use Delve Tokens to enter, and each kill offers a chest with tradeable loot.

Boss Details:

  • Max Hit: 46 (melee + magic hybrid)
  • Required Gear: High-range DPS with anti-venom
  • Recommended Stats: 90+ Ranged, 80+ Defence

Why It’s Profitable:

  • Unique drop: Mokhaiotl’s Fang (25M+)
  • Secondary drops: Spirit dust, bark, Delve bolts
  • 1.8–3M GP/hour depending on RNG and run efficiency

Quick Tips for Farming Delve Efficiently

  • Bring multiple Delve Tokens for back-to-back runs
  • Use Void Range or Crystal Armour for optimal DPS
  • Gem Crab upgrades improve your chest rewards

Need Help Choosing the Right Gear?

Check out our full breakdown of the best Delve boss farming gear for every budget and combat style. Whether you’re using Mokhaiotl’s Fang or sticking with ranged DPS, we’ve got optimized setups to boost your profits.

Want to Skip the Grind?

Buy OSRS gold at HeeraGold.gg and skip Delve prep. Fast delivery, great rates, and 24/7 support.