The ultimate two-player boss battle arrives with a dangerous twist:solo players can challenge fate by forging pacts for power-at a price.

Old School RuneScape continues to evolve its endgame PvM landscape with the introduction of Yama, the Master of Pacts, a boss unlike anything the game has seen before. Set deep within the Abyssal Vault, Yama arrival marks a daring new direction for boss design-combining mechanics tailored for duos with a high-stakes single-player mode that introduces a unique risk-reward system through demonic contracts.

Yama isn't just another brutal foe to add to the Slayer log. He's a test of coordination, resource management, and moral choice-something that adds depth far beyond just hitpoints and DPS.

Accessed through a newly discovered crevice in the southern Kharidian Desert, the Abyssal Vault is a labyrinth of cursed stone and shifting shadows. Inside, arcane energy pulses from every wall, reacting to the presence of intruders and distorting time and space. It's here that Yama resides—sealed away for millennia after betraying both Zarosian generals and Zamorakian warlocks during the Third Age.

The Vault is a two-player instanced arena with intricate environmental mechanics, but brave solo players can choose to face Yama alone. However, this path comes with a price:they must sign a pact before entry, invoking demonic assistance-along with consequences.

The two-player version of the Yama encounter emphasizes synchronization and reactive strategy. Each phase tests teamwork in unique ways:

Phase One:The Binding Circle-Players are tethered together by Yama dark magic, requiring coordinated movement to avoid shared damage zones. Failure to stay in sync amplifies all incoming attacks.

Phase Two:Pactborn Legions-Yama summons twisted contract spirits based on each player combat style. One player must draw aggro from their own spirit while the other destroys it—meaning role-swapping is essential.

Phase Three:Soul Auction-Yama pauses the battle and offers each player a deal:temporary invincibility in exchange for a random debuff after the fight. Accepting creates a short-term advantage—but possibly permanent disadvantages.

The final phase is a true test of endurance, as Yama merges with the shadows and turns the arena into a constantly shifting maze, forcing players to split and survive simultaneous mini-challenges before regrouping to land the final blow.

Victory yields powerful loot-but also binds the players to Yama influence. In-game lore and player journals suggest these contracts might impact future questlines or boss unlocks.

For solo adventurers, Yama offers a different game entirely. Entering the fight alone means being underpowered-unless the player agrees to a demonic pact. This pre-fight agreement grants temporary advantages to bridge the gap-but always at a price.

Players may choose up to three pacts, each offering buffs such as:

Flame of Greed-25% increased damage, but every 10 seconds, the player takes recoil damage.

Vision Beyond Sight-Highlights enemy attack zones in advance, but halves prayer restoration from potions.

Blood Borrow-Automatically restores health on dealing damage, but drains hitpoints rapidly below 30%.

Each pact chosen increases loot drop chances and quality, but stacking them makes the fight far more volatile. A fourth secret pact, called Yama Favor, can be unlocked after ten successful kills-but its true effect remains hidden, sparking debate across the community.

Yama drop table is among the most unique in OSRS to date. Some standout rewards include:

Grimoire of Binding-A tradeable off-hand book that, when equipped, lets players bind a defeated NPC soul for 60 seconds, gaining passive bonuses based on the slain creature.

Shackled Gauntlets-Untradeable gloves that increase DPS against demons and Abyssal creatures. Their strength scales with how many pacts you've signed with Yama.

Contracted Sigils-A rare drop that can be fused with existing god books to create Pactforged Tomes, adding special effects like life leech or pact-based teleportation.

The final reward isn't an item—but a title:Pactbound, awarded only to those who defeat Yama solo using three or more pacts simultaneously.

PvMers are praising the fight for its replayability and challenge. Meanwhile, ironmen are grappling with whether the rewards outweigh the pact penalties. High-risk, high-reward is the name of the game. Enhance your OSRS experience today with RSgoldfast fast, reliable, and secure OSRS Gold service. Easily level up your game!

Yama, the Master of Pacts, is more than a boss. He's a choice. Whether you tackle him with a trusted partner or brave the abyss alone, your decisions shape not just the battle, but potentially your future in Gielinor. With his unique mechanics, dual-mode design, and long-term implications, Yama pushes Old School RuneScape PvM into bold new territory.