Farming plan

Waveband Disruptor

Dropped by

Elite Vorac Harpi Uncommon 2.77 %

Elite Vorac Basilisk Uncommon 2.27 %

Vorac Basilisk Uncommon 1.66 %

Vorac Harpi Uncommon 1.66 %

Elite Vorac Weaver Rare 0.87 %

Vorac Weaver Rare 0.83 %

Vorac Gox Rare 0.47 %

Chance of getting it by number of runs

Each run has a 2.77% chance. The curve is 1−(1−p)ⁿ: there is never a guarantee, only growing confidence.