Photino Birds, Kardashev Scale Wiki

The Photino Birds are an ancient and extremely powerful species of dark matter entities from Steven Baxter's Xeelee Universe. They are the rivals of the Xeelee. They are composed entirely of dark matter and interact with normal matter only gravitationally. They are thus invisible, intangible, and effectively invulnerable; only extreme gravitational fields can harm them. They leech thermal energy from the cores of stars. Their attacks on the stars of the universe continued for billions of years.

How many Astartes/Custodes would it take to conquer terra as it is now? (2022) : r/Warhammer40k

Category:Alien Races, Kardashev Scale Wiki

Tree of life of birds almost complete

Kardashev scale - Wikipedia

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Multiversal Organization Compendium, Page 6

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Phoria Cards - Near and Distance, Assessments: Bernell Corporation

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WH40K] Would the Imperium show up on the Kardashev scale? : r/AskScienceFiction

Kardashev Scale Wiki

Kardashev scale - Wikipedia

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