Search any Warframe item

Isos: Drop sources, locations, and probabilities

Missions with a Chance to Get Isos as a Reward

Planet / Mission Type Rotation QuantityProbability
Venus / Bifrost Echo Skirmish Extra 5 14.29
Pluto / Seven Sirens Skirmish Extra 5 14.29
Pluto / Obol Crossing Skirmish Extra 5 14.29
Pluto / Fenton's Field Skirmish Extra 5 14.29
Pluto / Profit Margin Skirmish Extra 5 14.29
Pluto / Peregrine Axis Skirmish Extra 5 14.29
Veil / Calabash Skirmish Extra 5 14.29
Veil / Numina Skirmish Extra 5 14.29
Veil / Arc Silver Skirmish Extra 5 14.29
Veil / Erato Skirmish Extra 5 14.29
Veil / Lu-Yan Skirmish Extra 5 14.29
Pluto / Khufu Envoy Skirmish Extra 5 14.29
Neptune / Brom Cluster Skirmish Extra 5 14.29
Venus / Beacon Shield Ring Skirmish Extra 5 14.29
Venus / Orvin-Haarc Skirmish Extra 5 14.29
Venus / Vesper Strait Skirmish Extra 5 14.29
Venus / Luckless Expanse Skirmish Extra 5 14.29
Venus / Falling Glory Skirmish Extra 5 14.29
Neptune / Arva Vector Skirmish Extra 5 14.29
Neptune / Nu-Gua Mines Skirmish Extra 5 14.29
Neptune / Enkidu Ice Drifts Skirmish Extra 5 14.29
Neptune / Mammon's Prospect Skirmish Extra 5 14.29
Neptune / Sovereign Grasp Skirmish Extra 5 14.29
Veil / Sabmir Cloud Skirmish Extra 5 14.29

Mobs Dropping Isos

This is a region resource that can also be dropped by most ennemies on the corresponding planet(s). But here are a few other sources.
EnnemyProbability
Reinforced Grineer Storage Container 88.44%
Rare Corpus Storage Container 66.33%
Uncommon Corpus Storage Container 45.12%
Juvenile Membroid (Level 0 - 50) 32.59%
Orokin Storage Container (Level 0 - 50) 32.59%
Nascent Membroid (Level 0 - 50) 22.56%
Corpus Ramsled 22.11%
Reinforced Orokin Storage Container (Level 0 - 50) 20.29%
Apex Membroid (Level 0 - 50) 20.29%
Mature Membroid (Level 0 - 50) 20.17%
Rare Orokin Storage Container (Level 0 - 50) 20.17%
Kosma Taktis 17.69%
Cannon Battery 17.69%
Orm Harpi 16.58%
Vorac Weaver 16.58%
Orm Weaver 16.58%
Vorac Harpi 16.58%
Vorac Gox 16.58%
Vorac Crewship 16.58%
Taro Weaver 16.58%
Vorac Basilisk 16.58%
Taro Basilisk 16.58%
Taro Crewship 16.58%
Taro Gox 16.58%
Taro Harpi 16.58%
Orm Gox 16.58%
Orm Crewship 16.58%
Axio Crewship 16.58%
Axio Gox 16.58%
Axio Harpi 16.58%
Axio Weaver 16.58%
Elite Axio Basilisk 16.58%
Elite Axio Harpi 16.58%
Elite Axio Weaver 16.58%
Elite Orm Basilisk 16.58%
Elite Orm Harpi 16.58%
Elite Orm Weaver 16.58%
Elite Taro Basilisk 16.58%
Elite Taro Harpi 16.58%
Elite Vorac Basilisk 16.58%
Elite Vorac Weaver 16.58%
Gox Scavenger 16.58%
Elite Vorac Harpi 16.58%
Orm Basilisk 16.58%
Axio Basilisk 16.58%