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Dropped by
Eidolon Teralyst Rare 8.33 %
Chance of getting it by number of runs
0% 25% 50% 75% 100% 7 15 22 30 37 8 runs · 50% 8 runs · 50% 27 runs · 90% 27 runs · 90%

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