Diondra commands the Gyandlar faction as a female commander, invading the mechanical planet Cronos to seize the mythical Hyribead energy source. She operates directly under Gadess, the Gyandlar leader, and engages in major military campaigns against the series' protagonists. One pivotal operation sees her launch a large-scale assault on Emerald City alongside fellow commander Garudi, driven by intelligence hinting at the Hyribead's location and Gadess's deteriorating physical condition requiring its power. This attack follows protagonists Rom and Leina Stol aiding refugees' entry into the fortified city, triggering a prolonged battle where Diondra's forces initially overwhelm the defenders until reinforcements and ammunition resupply shift the conflict. Throughout the series, she commands and coordinates specialized Gyandlar operatives and monsters for targeted missions, including the polar specialist Zagam (possessing ice-based abilities and emotional ties to a Cronos resident resembling Leina), the evil dragon Mizuchi (sealed by Kirai Stol, wielding lightning and earth-splitting techniques), Jingi, Gillman, King Girandor, and Bug Newman. No concrete information exists regarding Diondra's background, motivations beyond serving Gyandlar objectives, character development, or appearances in related OVAs like *Leina: Wolf Sword Legend* or *Lightning Trap - Leina & Laika*.