Vilderavn

In their true form, a vilderavn is a great raven with a wingspan of 6–8 feet. Adaptable shapeshifters, they can change to the fighting forms of a snarling wolf, a hybrid of both wolf and raven, and a tall humanoid in black armor with a massive greatsword. More sinister is their ability to assume a humanoid guise suited to insinuating themselves into the retinues of boastful mortal rulers. With historical knowledge and clever rumormongering, they goad the proud into squabbles, feuds, and ultimately wars. The vilderavn stays at the ruler's side until victory is within grasp, the war almost won, then exacts the cruel stroke of betrayal. Their magic turns the mortals against each other, and the vilderavn's sword falls swiftly.