Ebon tiger

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These elusive creatures are described as "huge cats entirely comprised of black fire" by those who have seen them.

On prime-material worlds, where they prefer to hunt for "genuine" prey, ebon tigers' shadowy bodies allow them a 100% chance to hide under shad-ows.

Ebon tigers are immune to common weaponry, can move stealthily, and can easily fit through gaps or holes thanks to their insubstantial and nearly weightless bodies (even on the Prime).

The ebon tiger performs these feats by maintaining the majority of its body on the Border continually.

An ebon tiger can therefore feel and interact with both Border and Prime features (and threats) at once because it is "ethereal" even while it is "material"!