Farming plan

Serration

Dropped by

Eidolon Hydrolyst Rare 8.33 %

Another Betrayer, Rotation B Rare 1.47 %

Family Reunion, Rotation B Rare 1.47 %

Ghoul Expired Rare 1.47 %

Hot Mess, Rotation B Rare 1.47 %

Recover The Orokin Archive, Rotation B Rare 1.47 %

Sunkiller, Rotation B Rare 1.47 %

Table For Two, Rotation B Rare 1.47 %

The Aftermath, Rotation B Rare 1.47 %

Time's Up, Rotation B Rare 1.47 %

Nauseous Crawler Uncommon 0.33 %

Nauseous Void Shade Uncommon 0.33 %

Chance of getting it by number of runs

Each run has a 8.33% chance. The curve is 1−(1−p)ⁿ: there is never a guarantee, only growing confidence.