- A polar night occurs when the sun is below the horizon for more than 24 hours, that is, when no daylight shines during midday, only twilight at most. This natural phenomenon is exclusive to areas within the polar circles.
- This monster appears in the artwork of "Exchange of Night and Day".
- This card´s background is identical to the one of "Chaos Emperor Dragon - Envoy of the End".
- The knight himself is colored black, while his horse is white and points to the right corner, in contrast to "Gaia, the Mid-Knight Sun".
- This card and its counterpart, "Gaia, the Mid-Knight Sun", are a callback to when Yugi Muto first Ritual Summoned "Black Luster Soldier" using "Gaia The Fierce Knight" as a Tribute, as well as how "Gaia The Fierce Knight" is a requirement in summoning "Black Luster Soldier" in some games. This is further supported by how both this card and "Gaia, the Mid-Knight Sun" fit the requirements for summoning "Black Luster Soldier - Envoy of the Beginning" and "Black Luster Soldier - Envoy of the Evening Twilight".
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