Eidolon

As a species it is extinct; as an eidolon it retains its corporeality – but only if maintained in a state of equipoise.

Source: wiktionary

It was not hard to forge her image, her "eidolon", in the grey gloom of the little church.

Source: wiktionary

[…]Kit was sitting up staring into the dark at this eidolon, inelegantly turned out contrary to a whole raft of public-decency statutes, which had come monitory and breathing in to violate Kit's insomnia.

Source: wiktionary

In all my years of adventuring among the primitives and wild men of the world, I have never set eyes on a man who looked so savage, so elemental, so full of primal rage as the being that now climbed from the coffin; naked, sword in hand, its long black hair flowing behind it, its body covered head to toe in tattooes of eldritch imagery and ancient languages that resembled no script written by man. Sherman, the American general, is said to have told his enemies, begging for mercy, that they may as well appeal against the thunderstorm. What I beheld before me, I thought, was the very eidolon of the storm.

Source: wiktionary