Kill Ardo Dirtpaw.
You've stumbled upon a gnoll document. The gnoll that wrote this propaganda is semi-literate:
BROTHERS OF YOWLER, HEAR DIRTPAW! DIRTPAW GIVEN ORB FROM ORCS! DIRTPAW CONTROL ETTIN THINGS! DIRTPAW CRUSH HUMIES! COME GET DIRTPAW PAW-O-GRAPH IN RETHBAN CAVE. CAVE IS WEST, HIDDEN IN CANYON!
<There's a paw print as the signature.>
<There also appears to be a bite taken out of the scroll.>
You should probably investigate.