The Wilderness

As I see it you have two options before you. You could either try to figure out how to open the stone door and explore the cave or you could leave. The choice is yours.

What do you do?

You examine the door and it is just a solid stone slab. There are no features, designs, mechanisms or keyholes. You cannot see any way to open the door.

@HarbekYou see no obvious way to open the door either but this arena looks exactly like the first picture you examined in the room where you fought the wolves.

Vrizz'ka takes a peek at the door, seeing if there might be some mechanism that might be subject to their tools.

@Everyone
You spend a large part of your short rest examining the door and indeed the entire wall for some oddity, something that looks like an opening mechanism but you find nothing.

@Rabe
You sit down with your legs crossed and your arms folded tightly accross your waist. You meditate and open yourself to the ebbs and flows of magic. You close your eyes for a moment and feel the sockets fill with energy. When you open your eyes you see what appears to be a trail of dark magic leading through the door. The door itself seems unmagical so you turn and follow the trail of dark magic as it leaves the room and heads up the tunnel towards the entrance. As it does, you notice the magic gives the pedastal in the center of the arena a wide berth. The obelisk on the center of the pedastal is glowing with a brilliant red light. It is also, clearly magical and clearly powerful.