Delta watched as step one of the ‘plan’ was formed. The tunnel to Wyin groaned as three large stone doors formed. The thick stone sapped a lot of her Mana but Delta felt pleased as the thickness of the stone promised no one could punch through unless they were from Durence.They were almost faceless but the System wouldn’t allow Delta to simply seal the tunnel off and have no way to clear it within human limits...In the middle of all three doors was a simple keyhole. Devina held out a similar stone key and slid it into the first lock. The key went all the way in. She stood back as the door slid down, taking the key with it. A nimble enough person might be able to snatch it back... Delta would have to add some sort of twist or catch to the door. The first door slid down to simply reveal another stone door. Frustrating but Delta was sure people would accept it if they were used to Dungeons.Besides, the keys were more easily found after the next step in the ‘plan’.With a command, she brought the door back up and Devina took the key back.

I still think it’s too much of a hint. Let them wander... information will spread before we can stop it anyway.