The droplet fell on the floor, and the floor seemed to absorb it. the hand turned the same magical green as the torches, and the door opens.
The next room is almost as empty as the previous, altough there was something unsettling.
Here and there some skeletons where lying on the floor, they seemed to be dressed as adventurers, probably those who never made it back out.
Perhaps you should try to take a look around, for you saw something shiny in a corner.