Guide · strategy
Drop chance math: how multipliers actually stack
~5 min read·Reviewed v1.00.09·Updated 2026-06-04
Same-source vs cross-source
Inside one source (e.g. all your rune nodes contributing to Drop Chance Normal Chest), bonuses add: 10% + 7% + 7% = 24%. Across sources (rune total × gear mod × consumable buff), they multiply: 1.24 × 1.15 × 1.10 = ~1.57, or +57% effective.
The three buckets
- Rune bucket — permanent. Roughly +5% to +20% per node, additive within itself.
- Gear bucket — temporary while equipped. +Drop Chance rolls on accessories.
- Buff bucket — temporary timed buffs from items/events.
If you want to maximize drops, prioritize having something from each bucket equipped at once. Two runes is worth less than one rune + one gear mod + one buff for the same total raw %.
Diminishing returns
Drop Chance has a soft cap in the sense that you can only open chests as fast as your Auto-Open timer allows. Past about +200% combined drop chance, your bottleneck flips from "do I get a chest" to "can I open them fast enough". At that point, invest in Rune of Lubrication (reduce auto-open time) and Rune of Containment (max chest cap) instead of more drop chance.