Military action
Back in the Pleistocene epoch, when the literomantic Houses were new, there was a winter that lasted for years. This winter was accompanied by endless darkness. The Houses Avis and Lapin banded together to bring back the sun.
According to myth, the literomantic Houses were still new, and rarely engaged with one another outside of their own concerns. But The Big Birb and The Chief Rabbit decided to form an alliance to bring light and warmth back to the world. Together they faced down the Undead Horde, and after much loss, they were able to turn the tide, drive the Undead Horde underground once again, and bring back the sun. Avisalia commemorates this ancient alliance and its success.