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We know that Tioman is Nidhogg's consort, but what is she other than a dungeon boss? What kind of background information exists for her?
We should start with the fact that dragons don't have a traditional concept of gender. They can reproduce alone, aesexually. And after a dragon is born, over the course of a long life, their form changes radically.
For creatures such as these, a "mate" doesn't mean "a partner for reproduction" like it does for other organisms. It's more of a deep and spiritual bond. Even in the bond between the dragon Hraesvelgr and the human Shiva, the spiritual connection is what is important.
In the same vein, even though Tioman is presented as a "female dragon" that is Nidhogg's "consprt," this means that she is the most important being in his life, spiritually. It's still slightly different from a human concept like "marriage." These terms will probably be explored in the game, as well, as relations between man and dragon improve.
Emphasis mine, obviously "can" may not mean "always" but I'm not sold on the necessity of a breeding pair of dragons