They found a piece of birch bark with a drawing and an inscription in Glinnar script, made in a very clumsy handwriting. It seems to me that this thing can compete with the famous "I am a puppy."
It is written: "Dzhar'tskyi warrior, even Virꙗz call." Clementine inscription, because adaptation =D
PS Whoever this Viryaz was, he had an excellent portrait painter.