In The High King Queen Achren (then sorceress) said that if Arawn were to go into Prydain unprotected and in his true form, he would be killed on sight so Arawn always employed his shape-shifting powers when in Prydain.
In The High King, they attack and injure Kaw, the crow, as he spies on Annuvin, and they nearly kill the sorceress Achren, and she is only saved by an "army of crows" so great in number to drive away the eagle-sized gwythaints.
Both men are wounded as they and Melyngar are taken ... to Queen Achren in Spiral Castle.