RSorder OSRS: Forgotten Lockbox Impact

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This shows that unless your damage contribution is significantly higher than your partner's, soloing or duoing Yama results in RuneScape gold roughly the same total grind time.

Forgotten Lockbox Impact

The Forgotten Lockbox changes the dynamics. Each kill grants a 1 in 33 chance at a lockbox, regardless of your damage contribution. Within the lockbox, there is a 3 in 43 chance of obtaining any Oplate piece. This gives an overall 1 in 4,433 chance per kill for Oplate from the lockbox.

While that seems low, it actually improves the drop rate slightly:

Solo: from 1 in 200 → 1 in 191

Duo 50% damage: slightly better because the lockbox ignores contribution

With the lockbox considered, duoing can actually become slightly more efficient than soloing, as your odds from the lockbox are unaffected by shared damage.

Oplate Shards: Dry Protection

Without Oplate shards, a large portion of players can go thousands of KC without completing a full set. Including shards drastically reduces this grind.

Solo average KC with shards: 641 (down from 1,150)

Duo 50% damage: 1,200 KC (down from 2,000)

Shards create a secondary peak for unlucky players, ensuring that even those who get unlucky don't face extreme dry streaks. Unlike guaranteed drops, shards offer partial protection while still preserving the randomness and excitement of loot acquisition.

Contracts: The God-Tier Advantage

Completing contracts further improves efficiency. Two contracts are relevant:

Contract of Oplate Acquisition - guarantees a piece on completion

Contract of Oplate Shard Acquisition - boosts your shard collection

For players consistently completing contracts:

Solo average KC drops to 550

Duo 50% damage drops to 1,040

Contracts offer significant time savings for players skilled enough to complete them reliably. Why Yama's Design is Brilliant

Yama's drop mechanics are more than just RNG-they incentivize teamwork and smart play.

Duo Incentives: Forgotten lockboxes make duoing potentially faster than soloing.

Dry Protection: Oplate shards prevent extreme unlucky streaks while maintaining the thrill of randomness.

Contracts: God-tier players can further reduce grind times, rewarding skill and planning.

Compared to other bosses, Yama strikes a balance between solo viability, team efficiency, and long-term fairness. It's one of the best-designed bosses in the game from both a mathematical and gameplay perspective.

In conclusion, Yama isn't just profitable-it's a masterclass in cheap RS gold boss design. Whether you're going solo, duoing, or aiming for god-tier efficiency with contracts, understanding the math behind Oplate drops can save you hours and make your grind far more predictable.