- "Lethaeus" is a Latin adjective meaning "of or relating to Lethe", "of the underworld", or "causing forgetfulness or sleepiness" .
- This is also a reference to the partner Lethe.
- Lethaeus was added to Lanota as part of the Lanota x Arcaea collaboration.
- A remixed version of Lethaeus named Alismonitos Lethaeus can be found in Silentroom's anthology album Rainbow Frontier. According to his postscript for the album, he was inspired to make this remix after Lethaeus was sampled in Ignotus Afterburn.
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