| Kills | Chance of getting at least 1 drop | Still dry |
|---|
Formula: P(at least 1 drop in N kills) = 1 - (1 - p)^N, where p is the effective drop chance per kill.
This is exact binomial probability, not an approximation. Kills for X% confidence: N = ln(1 - X) / ln(1 - p).
Drop Rate Bonus applies as: effective rate = base rate * (1 + party bonus) * (1 + Drop Rate stat / 100), per game formula from Formula$$GetDamage (drop section).