You set up camp for the night in a very wide and open cave, keeping your belongings and fire in a peaceful corner of the cave. That was when you found a small pile of gold on the cold stone floor. You considered yourself lucky and picked up a few. Then, one of your torches fell over and revealed a much larger pile of gold, leading to a mountain of it, growing all the way to the back of the cave.
The wyrm suddenly awoke, mildly startled by a small light in a corner of the cave. Something new. It had never seen something new in... well, it had lost track of time in the dark of this cave. It uncoiled itself from one of the pillars holding the cavern up, slowly sliding down the mounds of gold reaching up to the ceiling.
You suddenly saw two bright yellow eyes, their centers separated by a slit pupil, slowly getting closer. You could hear the small roar of thousands of gold pieces flowing like water from the mountains of gold as whatever giant beast was in here slid your way. When it came into the light, you saw it was a wyrm. And a big one. It had dull, aged, plant colored scales and a dirty tan underbelly. It stopped at the edge of your camp, it's head raised high above you, eyeing you warily.