They don't care about water? Fine. Let's make this water dramatic.
Imagine, if you will, a humble bottle of water.
Then, imagine how you'd feel if the water suddenly turned red.
Finally, imagine how the Orks would feel if their god started crying blood - yup. Dramatic water.
Steady on - first, we need to make this believable by having the Orks do something regrettable.
The shaman is clearly performing some kind of ritual - Gods hate nothing more than rituals being interrupted.
When we first entered the shaman's area, the drummer had to be reminded of the correct rhythm.
If we made the drummer lose tempo again, the shaman may decide that he doesn't need a drummer anymore.
The nearby puddle is dripping at a constant rate; Geron observes that it's a different speed to the drumming, however.
If the drummer was distracted by the dripping, it'd be a sound that's hard to ignore.
Amplify the noise of the drips by putting something hollow in the puddle.
There's bound to be some hollow bones among all the corpses in the camp - check for skulls.
You'll find a 'split skull' next to the Nuri.
Hooray! Unfortunately, that splitting headache isn't great at increasing the volume. Try putting it back together.
When you're next to Nuri, use the 'repair' spell on the split skull.
Don't worry if you already put it in the puddle - you can pick it back up again.
Put the repaired skull on the puddle near the drummer. I would not want to be that guy.
Back in camp, you may have missed a strange-looking pool of water; get a closer look at it.
Yes, it's a cool rock, but it'll also prove useful. Take a piece.
You'll need to make use of something sharp to get a piece.
Use your knife to take a chunk of the 'red rock' - it won't be enough on its own, though.
You'll need to find something that will fit into the statue's jaw, and get the water to flow through it.
The object you're looking for is an instrument of both music and war.
The Ork that was drumming for the shaman also has a warhorn strapped to his drum.
You've got something sharp.
Use the knife to get the warhorn free.
Perfect - there's a notch in the statue's mouth that will fit the horn wonderfully.
All that's left after that is to let the river run red with... stones.
That seemed to do the trick - head back down to the camp and see what's going on.