The blue gem vibrates three times, then a ghostly hand emerges from the gem. The hand is flat, as though it's being projected onto an invisible screen. After forming, it wraps it's fingers around into a pointing gesture aimed right at you. A second passes, then you hear a chime. The hand changes to a thumbs up.
The letters in the message melt together into a bright, shining keyhole. The hand drifts over, sticks its thumb in and turns. Both the hand and an entire section of the wall disappear, creating an entrance into the tower. There's a hazy fog drifting out of the doorway, making it difficult to see the room inside.
