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The Moon Gate is a location named in the Fatekeeper gameplay reveal trailer. The Druid and the talking rat are heading toward it; the rat references it directly during banter. Beyond the name, almost nothing about the Moon Gate has been published, and nothing in the three shipped Early Access patches or the August 2026 development update adds to it.
What is Confirmed

The Moon Gate is a destination, not a passing landmark.
Reaching the Moon Gate is part of an early-game route shown in the reveal trailer.
The talking rat knows about it and references it explicitly.
What is Not Confirmed
Whether the Moon Gate is a literal gate, a settlement, a ritual site, or a chunk of architecture.
Whether the Moon Gate connects to the Underdwellers or to surface lore.
Whether reaching the Moon Gate is the campaign's main objective, a side beat, or an early goal that opens onto something larger.
Whether the name is metaphorical (the moon being a half-remembered myth in Underdweller history) or descriptive.
Speculation
The published lore makes the moon a recurring symbol: the Underdwellers' surface-rediscovery dev blog talks about the moon as one of the things that overwhelmed them when they finally broke back to the surface. A gate named for the moon could be a site of significance to either side of the surface-versus-underground conflict, or to the Sentinels of Solace. Without further dev material, this is interpretation rather than fact.