Serration

Farming plan

Serration

Confidence

Direct sources

We assume ~2.5 min per relic opening (short fissure). Per-mission timings are labeled by source: derived from game mechanics or community-estimated.

Expected runs = 100/chance · Runs for confidence p = ⌈ln(1−p)/ln(1−chance)⌉ · In a squad of 4 opening the same relic, the chance your part shows among the reveals is 1−(1−chance)⁴.

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
0% 25% 50% 75% 100% 7 14 22 29 36 8 runs · 50% 8 runs · 50% 26 runs · 90% 26 runs · 90%

Each run has a 8.6% chance. The curve is 1−(1−p)ⁿ: there is never a guarantee, only growing confidence.