I wouldn't really call it a moon it's kinda small for that but yeah Vivec (and the entire Tribunal and their cult) were renowned pieces of shit

Love seeing Morrowind references in the wild.

By the way, it's strongly implied in the game that holding those meteorites suspended above the city is a bargaining chip by Vivec to scare people into continued worship of him to offset the fading power of the heart of Lorkhan (which they used to become the tribunal of gods in the first place).

This is also why, in the expansion (after the Nerevarine destroys the heart) we see the meteorites falling to the earth after Vivec disappears. This eventually triggers the apocalyptic red year, which leaves large parts of Morrowind destroyed and explains the dark elf refugees in TES V (plus the expansion where you can see the mainland of Morrowind as a smouldering ruin from the shore of Solstheim).