Ebon tiger

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Ebon tigers were elusive creatures inhabiting the Ethereal Plane.

Description
They were described as huge cats entirely composed of black fire by those who have seen them.

Abilities
On Prime Material Plane worlds, where they preferred to hunt for "genuine" prey, ebon tigers' shadowy bodies allowed them to hide amongst shadows with perfect ease. Ebon tigers were also immune to common weaponry, could move stealthily, and could easily fit through gaps or holes thanks to their insubstantial and nearly weightless bodies (even on the Prime Material Plane). The ebon tiger performed these feats by keeping the majority of its body on the Border Ethereal. An ebon tiger could therefore feel and interact with both Border and Prime features (and threats) at once because it was ethereal even while it was material.