RSorder OSRS: With the lockbox considered
If you kill Yama solo, the odds of getting any Oplate piece are 1 in 200, or 1 in 600 for a specific piece. Using the coupon collector problem, we can calculate the expected KC to RuneScape gold complete a full set:
Average KC=200×3×1.83≈1,100
Average KC=200×3×1.83≈1,100
So, purely from direct drops, you'd expect to complete your Oplate set after around 1,100 solo kills.
In a duo, your drop rates scale with your damage contribution. Doing 50% of the damage reduces your odds to 1 in 400 (or 1 in 1,200 for a specific piece). Doing 60% of the damage improves this slightly to 1 in 333.
Time Analysis


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