Forged by the dark god Tenebre from bone and shadows, Grave Sentinels are ancient, fearsome guardians of the Umbra Graveyard. These creatures have a grotesque form, featuring three serpent-like heads, each resembling a different snake, sprouting from a powerful torso with two massive clawed arms. Their lower bodies extend into five tails that drag across the ground when not in use.

Originally created to protect the graves of the umbra from desecration, the sentinels have developed a consciousness over the ages, enhancing their abilities. The central head can see through falsehoods, ensuring no trickery goes unnoticed. The left head can summon dark bonds to restrain thieves, while the right head can consume the memories of intruders, erasing all knowledge of the graveyard's location.

Though they are relentless against anyone attempting to steal remains from the graveyard, the sentinels coexist peacefully with other creatures that reside there, viewing them as part of the graveyard they are sworn to protect.

These formidable guardians, with their terrifying appearance and powerful abilities, ensure that the sanctity of the Umbra Graveyard remains undisturbed.