The Anu Nebula was the center of opposition to the Alliance, which was destroyed and looted by humans in 541 (before the collapse of the Planetary Alliance)and the particle was presented to the United Nations as a gift from Mars Command Center.
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This nebula was named after the Sumerian god Anu to represent human civilization.
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Humans transported the particle to Metaverse before being destroyed by the Xen in the Black Mesa War to protect human civilization.
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Humans managed to trap Nihilanth inside this particle in Metaverse.
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Dingir (𒀭, usually transliterated DIĜIR Sumerian pronunciation: tiŋiɾ) is a Sumerian word for "goddess".
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The cuneiform sign by itself was originally an ideogram for the Sumerian word anu ("sky"); its use was then extended to a logogram for the word diĝir ("goddess") And was named the supreme deity of the Sumerian pantheon Anu.
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The Nihilanth was the supreme leader of the Xen forces that invaded Earth during the Black Mesa Incident.