Yama Boss Guide OSRS (2025) – How to Defeat Yama, Best Gear Setup, Contracts & Rewards

Yama Boss Guide OSRS (2025) - How to Defeat Yama, Best Gear Setup, Contracts & Rewards

Old School RuneScape (OSRS) has once again stirred the community with a brand-new, endgame-level boss: Yama – The Master of Pacts. Introduced on May 14, 2025, Yama is a high-risk, high-reward boss fight located in the terrifying depths of the Chasm of Fire. Designed for experienced players, this guide will provide a detailed overview of the Yama boss fight, including requirements, gear setups, contract modifiers, combat mechanics, and the lucrative rewards you can earn.

Whether you’re planning to farm Yama for profits or take on the challenge for the thrill, this guide has you covered with over 3,000 words of detailed content to help you master the encounter.

Table of Contents

  1. Who is Yama?
  2. Location & Access Requirements
  3. Solo vs. Duo Mechanics
  4. Demonic Contracts: Risk vs. Reward
  5. Recommended Stats
  6. Best Gear Setups (Melee / Mage / Hybrid)
  7. Inventory Setup
  8. Yama Combat Mechanics (Phases & Attacks)
  9. The Arena: Navigating the Chasm of Fire
  10. Rewards & Unique Drops
  11. Strategies for Farming Yama Efficiently
  12. Final Thoughts

1. Who is Yama?

Yama is a new PvM boss described as a “demonic force that feeds on binding mortals to pacts.” Lore-wise, he resides at the very bottom of the Chasm of Fire, a demon-infested dungeon beneath Shayzien. He is the first OSRS boss to feature contract mechanics—customizable difficulty modifiers that influence the rewards you receive.

Yama’s introduction has added depth to endgame content, especially for those who have conquered Inferno, Raids, and the Phantom Muspah.

2. Location & Access Requirements

Location:

Yama resides in a newly opened chamber within the Chasm of Fire, located west of Shayzien in Great Kourend.

Requirements to Access:

  • Quest: Must complete A Kingdom Divided
  • Combat Level: 100+ recommended
  • Agility: 60+ to use shortcuts inside the Chasm
  • Fire Protection: Chasm environment deals passive heat damage, so Fire Resistance potions or Phoenix necklaces are helpful

To get there quickly, use a Xeric’s Talisman teleport to Shayzien, then head west.

3. Solo vs. Duo Mechanics

Yama is a versatile boss who can be challenged solo or with a partner. However, Jagex designed the fight to scale based on the number of players. In duo mode, his HP, damage, and mechanics scale, but you benefit from shared damage responsibility and more loot drops.

Solo Mode Tips:

  • Expect longer fight duration
  • You must manage all mechanics alone
  • Recommended only if you’re confident in PvM

Duo Mode Tips:

  • Communicate with your partner (voice chat helps)
  • Designate roles (e.g., melee tank and mage DPS)
  • Bring complementary gear for faster kill times

4. Demonic Contracts: Risk vs. Reward

Yama introduces a never-before-seen mechanic in OSRS: Demonic Contracts. These are consumable items that you can activate before entering the fight to enhance difficulty but also greatly boost your loot chances.

Types of Contracts:

  1. Blood Pact – Yama regenerates HP over time
  2. Infernal Pact – Floor becomes lava periodically
  3. Mirror Pact – Summons a shadow clone of the player
  4. Chaos Pact – Prayer switching is disabled for 20 seconds
  5. Despair Pact – Special attacks cost double energy
  6. Void Pact – Stat-draining over time
  7. All-In Pact – All above effects combined (massive reward boost)

Each contract increases the chance of unique loot drops. Contracts are tradable and can be bought on the Grand Exchange.

5. Recommended Stats

To tackle Yama effectively, here are the minimum recommended stats:

  • Attack/Strength/Defence: 85+
  • Ranged: 85+ (optional hybrid phase)
  • Magic: 80+
  • Prayer: 77+ (Rigour and Augury)
  • Hitpoints: 90+
  • Agility: 60+ (for navigation)

6. Best Gear Setups

Melee DPS Setup:

  • Helmet: Neitiznot Faceguard
  • Body: Bandos Chestplate / Justiciar Chestguard
  • Legs: Bandos Tassets
  • Boots: Primordial Boots
  • Amulet: Amulet of Torture
  • Cape: Infernal Cape / Fire Cape
  • Weapon: Scythe of Vitur / Abyssal Tentacle
  • Ring: Berserker Ring (i)

Magic Setup:

  • Helmet: Ancestral Hat
  • Body: Ancestral Robe Top
  • Legs: Ancestral Robe Bottom
  • Boots: Eternal Boots
  • Amulet: Occult Necklace
  • Cape: Imbued God Cape
  • Weapon: Sanguinesti Staff / Trident of the Swamp
  • Ring: Seers Ring (i)

Hybrid (Duo Mode Recommended):

  • Use mage + melee switch to adapt quickly
  • Keep inventory minimal to reduce overhead switching

7. Inventory Setup

Essentials:

  • Super Combat Potion
  • Prayer Potions / Super Restore
  • Karambwan + Shark combo food
  • Stamina Potion
  • Demonic Contract (optional)
  • Teleport to House / Ectophial
  • Phoenix Necklace / Ring of Life
  • Sanfew Serum (for poison/burns)

8. Yama Combat Mechanics

Yama’s fight consists of three main phases, each with increasing complexity:

Phase 1: Summoning

  • Summons low-level demons (Aggressive)
  • Basic melee & magic attacks
  • Use Protect from Melee

Phase 2: Flame Walls & Contract Effects

  • Flame wall mechanic (must dodge)
  • Shadow pools on the floor – standing inside causes heavy DoT
  • Contracts begin activating
  • Prayer Flicking becomes essential

Phase 3: The Pactbreaker

  • Yama activates his full power
  • Special attack: Pactbreaker (destroys 50% of your Prayer & deals 40 damage if not protected)
  • Must coordinate if in duo mode to tank and DPS alternately

Special Attacks:

  • Infernal Burst – Rains fire across half the arena
  • Demonic Shriek – Disables prayers for 5 seconds
  • Soul Drain – Leaches stats from players standing still

9. Navigating the Chasm of Fire

The Chasm of Fire is more than just a path to the boss; it’s a test of endurance.

Tips:

  • Bring agility potions to reduce damage from traps
  • Avoid standing still for too long
  • Demons respawn frequently – safe spots are limited
  • Use Protect from Melee when passing through tight corridors

10. Rewards & Unique Drops

Yama is one of the most rewarding bosses in OSRS.

Unique Drops:

  • Oathplate Armor Set – High defence gear, tradeable
  • Diabolic Worms – Rare fishing bait for skilling
  • Soulflame Horn – Magical horn with AoE debuff
  • Surge Potion – Restores 25% special attack energy
  • Yama’s Pact Sigil – Used to craft untradeable gear

Common Drops:

  • Noted herbs, ores, and high-level runes
  • Clue scrolls (elite & master)
  • Demonic Contracts (1 in 5 chance)

Expected profit per hour: 3M to 8M GP depending on contract usage

11. Strategies for Farming Yama Efficiently

  • Duo Mode yields more consistent profits with less stress
  • Specialize your role: Tank or DPS
  • Use high DPS gear and Prayer-efficient setups
  • Regear efficiently between kills
  • Stockpile contracts during cheap GE periods
  • Keep an eye on Grand Exchange prices of rare drops

12. Final Thoughts

Yama brings a new level of intensity and customization to OSRS PvM. The introduction of Demonic Contracts, scalable mechanics, and unique drops makes it a refreshing challenge even for veteran players. Whether you’re in it for the adrenaline rush or the potential for big profits, mastering Yama is a worthy goal.

Stay prepared, stay focused, and may the loot be ever in your favor!

Have any tips or drops to share? Let us know in the comments below!