Final Clue

The letter tells me about the pattern Vankelo's found in the depths of the Barren Caves of the Barrow; more specifically, he says he found it near a skeleton in the nest of that demon Anglie. While he cannot remember any other details, he is nevertheless sure that the pattern is somehow related to Anglie.
Ans so it seems that the clue about Milaya's origins lies with Anglie. My dear adventurer, are you willing to destroy this evil and find the final piece of this puzzle?
Yet, I will push you no further, as entry to that cave has been prohibited. Do so at your own peril!
:- [George], Mayor of Logar