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.
Progress
<The orb emanates powerful magic>
Completion
<The orb hisses as you touch it.>
Notes
While killing gnolls for Canyon Romp and Like a Fart in the Wind, the Dirt-Stained Scroll stands a chance of dropping. The followup to Canyon Romp, They've Wised Up... also directs players to Rethban, so accept and keep moving that way. The entrance to the caverns is north of the westernmost camp of the canyons at [20.1, 31.8]
north of Lakeshire. Head to the northwest corner of the cave, kill Ardo and interact with the Ettin Control Orb.