You come across a mountain where it is said an ancient dwarven city once was

Perhaps you came alone, or with a group. Perhaps you came seeking riches that the dwarves always horded, or powerful artifacts they crafted. Maybe you’re a historian eager to study the culture of a dead city, or perhaps you just ended up by this mountain in your travels. It’s a local legend that a great dwarven city dwelled beneath this mountain in times past, but the dwarves here are long since gone, and any trace of the city are buried in rock, with no known passageways inside.

So it strikes you as odd when you see a cave burrowing into the mountain.

And…if you peer down the way enough…you think you can even see a light down there.

What is your next move?