Receive Frenzy Root that you received from the captain.
Travel to the Ree orc camp, west of the nomads. ( 80, -48, -755 ) /waypoint 80, -48, -755
Let 5 orcs taste the frenzy root:
Place the frenzy root in the path of one of the wandering orcs not already under the Frenzy effect where they will pick it up. (the easiest way, I have seen to do this, is walk right up to a stationary orc and drop the root. Then run to break the encounter, and follow the orc back, when he runs back to his spot he will always grab the root.)
From your inventory or your charm slot (the roots are equippable), right click to use the root (you can create a hotbar button to speed up use).
Note: if the orc doesn't turn to face the root and begin examining it, you can right click on the root on the ground to pick it up again.
Examine the chest in the camp to find the Ree Orders. ( 73, -47, -756 ) /waypoint 73, -47, -756