Acting on a hunch, I cross-referenced my transcription with a history of known daedra and their inclinations.

'<<1>>,' one of the Winged Twilights, appears several times in service to Azura. If this is the same creature, it would appear the Ayleidoon had some manner of accord with the beast.

It appears likely the stone bears a ritual designed to summon it forth! I will investigate further on the morrow.

— <<2>>