Within the belly of the Shinigami is a hellish dimension home to hungry ghosts, or pretas. As their lord, he is able to release the hungry ghosts, who are made completely of spiritual energy, into the material world and manipulate them to do his bidding.
These worm-like ghosts possess many mouths and ravenously seek the physical energy found in chakra to achieve a balance they are doomed to never attain. The pretas, while being strangely impervious to most attacks barring those with black receivers, are able to take bites out of their target, stealing their physical energy and inflicting bodily damage. If bitten too much, the victim begins to experience growing fatigue and an inability to properly mold chakra due to an imbalance of the physical:spiritual energy ratio. The victim inevitably dies once their physical energy is completely drained.
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