Third Letter to Norman Giles:Lucet and Tettens are the Twins, the Children of Night and the Serpent, brothers and some say one and the same person. Fire and Air, growth and decay. One looks forward, the other backward. One creates, the other destroys, Castor and Pollox.
Witch Eye #10: The Winged Serpent: Seeing the Divine Twins, by Anaar:The God of Feri are twins but they are one, not separate entities. They are identical, either one or both can occupy the place of God. The Divine Twins can function alone or as a pair. Alone, they may function as a male, but are actually both male and female in each entity. The Twins may also be both female, or a male and a female. To place further confusion on the matter, the Divine twins represent a polarity. The polarity may be great or small, and are often in opposition. In fact, The Divine Twins as represented in other cultures are often seen to be rivals or adversaries.
The Divine Twins can be seen in both Feri and 1734.
In 1734, they are Lucet and Tettens, the lord of the East and of Fire, and the lord of the North and of Air. They are a polarity, one creating, the other destroying. Lucet is the light-bringer; Tettens is the lord of the night, in the far north in winter.
In Feri, we once again see the polarity. Here, they might be two males, two females, or a female and a male. They might be Dian y Glas and of Melek Ta'us. They might be Dian y Glas and Nimue. They might be Mari and Krom. They might be Anna and Arddhu. They might even be Nimue and Arddhu. Yet they aren't just a polarity, they are one. You can't separate them one from another.
~Muninn's Kiss