Born from an ancient clutch of eggs that absorbed the negative energy from a failed Phoenix rebirth cycle, the Basilisk Negator harbors an instinctual hatred for the fiery bird's renewal process. Discovered by Zephyr Shadowcloak in a forgotten obsidian cave, its natural ability to convert life energy to stone was refined and focused specifically to counter Phoenix manifestations, making it an invaluable asset to the Sentinels' cause.

The Basilisk Negator possesses a deadly gaze that can transmute Phoenix energy into obsidian stone, effectively freezing the rebirth process wherever it manifests. Its cold-blooded physiology creates a natural immunity to the Phoenix's heat, allowing it to venture where other Sentinels cannot. The creature can detect traces of Phoenix ash through specialized heat-sensitive pits along its jaw, and wears a harness of specially treated obsidian scales that amplify its petrifying abilities while protecting it from residual Phoenix energy.

As the Obsidian Sentinels' premier anti-Phoenix specialist, the Basilisk Negator is deployed to sacred sites just before Phoenix energy reaches critical mass, where it systematically converts flame manifestations to stone and disrupts the energy patterns necessary for rebirth. It serves as both scout and saboteur, identifying potential rebirth locations and rendering them unusable through strategic petrification of key energy nexus points.