Having to have come close for Rianna to be spotted, she only needs to step forward and run the native through to kill him. Which she does, his cry of alarm turning to a cry of pain. He plops into the mud.
That is when a smoothed rock zips out of the darkness and strikes Rianna in the side for 6 damage, leaving a solidly bruised rib. Two more fly past you, vanishing into the fog as quickly as they pop out of it.
The two of you converge on the direction from which the stones came, keeping low in the reeds to stay hidden. Dak rolls a comfortable 15, but Rianna rolls a 5... which Distract can fix! Rianna can perform a brief distraction of her choosing before Dak and Rianna spring up and drag the sentries- who are armed with primitive slings- into the reeds. Once they are dead, you sense that the sentries are not close enough to find you.
Rianna ventures back out into the fog. Observation for finding the sentries is useless here, and so we make a roll based on her Force rating. 8... not terribly difficult to sense their fear, and so you head in their direction. She makes an Intrusion check to creep up on them through the fog and mud... 6 is a pass. You come upon a group of them heading back towards the village, passing them quietly on their right and distracting them with a strange noise to the left...
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Dak moves into the village, trying to find something that resembles a primitive armory. Intrusion is passed just fine... but what will you be looking for to find their weapons stash?