[SlyJohnny]

She moves closer, peering over Vhaenys' shoulder. She nods, as if having checked something and satisfied herself.

"We are looking at an elemental key. The door is linked to four different destinations, and can be configured by applying a specimen of the appropriate element to the fresco. Observe."

Merla scoops up a handful of dirt and loose stones, and hurls them at the door.