WarframeAlchemyLab ES
Lightning Rod

Farming plan

Lightning Rod

Arsenal: Lightning Rod
Dropped by
Ghoul Expired Common 7.59 %
Kuva Scorpion Common 1.14 %
Narmer Scorpion Common 1.14 %
Scorpion Common 1.14 %
Ancient Healer Uncommon 0.76 %
Ancient Protector Uncommon 0.76 %
Deimos Ancient Healer Uncommon 0.76 %
Deimos Swarm Mutalist Moa Uncommon 0.76 %
Swarm Mutalist Moa Uncommon 0.76 %
Chance of getting it by number of runs
0% 25% 50% 75% 100% 8 16 25 33 41 9 runs · 50% 9 runs · 50% 30 runs · 90% 30 runs · 90%

Each run has a 7.59% chance. The curve is 1−(1−p)ⁿ: there is never a guarantee, only growing confidence.