With no difficulty whatsoever, Canon manages to use this makeshift grapple to hook onto a crenellation near a second story window. He tugs it a couple of times to make sure it is secure, and sure enough it is. All of you are able to climb up and are now standing on a small roof that lies below the second story windows. Checking them reveals that they are locked, but it is possible that they could be picked or forced open. 

Jedavii reaches for the lock, but decides instead to listen closely near the window, sensing for the patrolling magical servants. If possible, he tries to determine how long each pass of their patrol is.

Perception + Guidance: 25

Robin moves up to a window and looks through. If the coast is clear she uses misty step to get inside and unlock the window for the others.

Jedavii peers into the window. It looks like what is within is a grand lounge. This spacious lounge is decorated to an arcano-bio­logist’s tastes. Paintings of strange magic creatures line the walls, as do mounted collections of insects and reptiles. Three pteranodons form the room’s centerpiece—all of them magically immobile in midair, positioned as if engaging in a strange dance. As far as Jedavii can tell, there is no movement within the room. Whatever patrolling constructs may inhabit this building, there are none of them here.

Robin flashes into the room, the curtains parting as though a gust of wind blew through them. It is easy enough to find the lock on the window and unlatch it, then open it to allow the others in. But she hears strange noises behind her - the pteranodons! What was previously immobile decorations of the room's centerpiece are now flying around the room, squawking and getting ready to dive bomb the intruders!

Time to roll for initiative!
Canon: 2
Jedavii: 3
Marius: 18
Robin: 14

14 pteranodon initiative

Order:

ROBIN
PTERANODONS
CANON
MARIUS
JEDAVII

It is Robin's turn! There are three pteranodons ten feet away from you!