The Bunyip Sentinel originated from the ancient waterways of Australia, where it was worshipped as a water spirit by indigenous tribes. When the Obsidian Sentinels discovered its ability to manipulate water and create powerful currents, they recruited it as a specialized operative to guard sacred sites near bodies of water and disrupt the Ashen Pilgrims' progress.

The Bunyip Sentinel possesses the ability to manipulate water, creating powerful currents and whirlpools to obscure sacred ashes and extinguish Phoenix flames. It can also generate thick mists to disorient travelers and summon water spirits to aid in its tasks. Its connection to ancient waterways gives it enhanced strength and durability in aquatic environments.

The Bunyip Sentinel serves as a specialized aquatic operative for the Obsidian Sentinels, guarding sacred sites near bodies of water and using its water-based abilities to create obstacles for the Ashen Pilgrims. It plays a crucial role in maintaining the balance of power by preventing the Phoenix's rebirth near aquatic locations.