"I don't know," says Saslic, "we entered here a few days ago and cleared out a nest of zombies. Maybe the undead were corrupting the trees."
"Nothing to worry about!" says Banelin, "There must be treasure in there, and we're going to bring it out." Then he mutters under his breath, "As long as I don't trip over me own feet again..."
Saslic rolls her eyes a bit at Banelin, "We need some preparations before we go in. Cut some strips off this blanket and wrap it around your boots - the halls in here are echo a lot. We need to be quieter." Digging into the bags carried by the others, she pulls out flasks of oil and torches and hands them out to her companions. "In case we run into more zombies, use these. Zombies are slow and burn well, we can safely retreat and not risk hand to hand combat."
"Saslic and I will lead," says Banelin, "We can see pretty well in the dark, so I need two of you carrying torches at the back for the others." He pulls out a handaxe and tosses it in the air experimentally. "We will go in carefully, looking for old treasures, I'm sure there is a fair bit in here. You'll all get your share and a bonus if you do well - which I'm certain you will."
Saslic makes sure that Ojet and Tiraon stay at the entrance. "We will come back this way, but if you hear anything that is not us, make for the trees up the hill and hide. Do not go down into the valley - there are hobgoblins and orcs down there!"