Herensuge
The great serpent of Basque myth, kin to Sugaar the storm-serpent whose union with the goddess Mari makes the thunder.

Herensuge is the great serpent of Basque legend, sometimes seven-headed; in some tellings its final flight will mark the end of an age. It belongs to the same mythic family as Sugaar, the pre-Christian serpent-consort of the goddess Mari: the male serpent of storms who joins the mountain goddess, their meetings making thunder over the peaks. One of Europe's oldest surviving serpent-cosmologies, kept in one of its oldest surviving languages.
The SGE Reading
Shadow as weather: the storm-serpent's meetings with the goddess are fearsome and fertile at once — thunder, then rain.
Canon Resonance
Echo of Bhutan's thunder dragon at the other end of Eurasia: the serpent whose voice is thunder, followed by rain.
A Micro-Practice
Next storm, sit by a window and let it speak for what storms in you. Note what feels fertile afterwards.
Sources & Respect
Basque mythology scholarship (Barandiarán and successors).