Hadiss became the leader of the Stalgasin Hive during the years prior to the Invasion of Naboo. A veteran of the physical and mental battles forced upon the Geonosians during their evolution, Hadiss the Vaulted preferred to solve issues in battle. Rather than simply allowing criminals and undesirables to survive in the gladiator arenas of his homeworld, Hadiss ensured that any individual who survived the necessary trials faced an enraged acklay.
His leadership skills were questioned by a small minority, led by Poggle the Lesser, during the years prior to the Clone Wars. After Poggle managed to win his way out of the gladiator arena, Poggle led an insurrection against Hadiss for several years, but Hadiss was relatively unconcerned. Then Poggle met Darth Sidious, the Dark Lord of the Sith, and received renewed finances and weapons. In a twist of fate, Poggle attacked Hadiss while riding on the back of an acklay, which cut Hadiss into three pieces before devouring him. It is believed that part of his corpse made its way into Poggle's cane.
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