Selsträ was very stuck. She had hit a mountain that was too obvious to be anything but a decoy, but too well guarded to be anything but the actual location. At any rate, Selsträ couldn't find a way around it.
The place initially seemed to be very calm, and the tension in the space did let up around the mountain. The random rifts had stopped opening. Selsträ eventually decided that it had become too calm, and gathered a snowball to float in front of her by several arm's lengths. After taking two steps, the snowball was devoured in a massive rift. After about an hour of experimentation, Selsträ had identified the trap, or whatever was naturally happening. The rifts were reacting to the slightest deviation from the natural aer flow; fireballs, enchanted ice, lightning, wind, dark aer, light aer, neutral aer, and the small snow golem Selsträ took five minutes to make. The boundary for the rifts was very well defined; Selsträ had spent most of the last hour creating small snow golems and having them fly in formation almost a hair's breadth away from where the first snowball had been devoured. There were currently 20 of what looked like winged snowballs zooming around.
Selsträ walked around some more, and contacted the fortress about what she'd found. She would make sure to come back to camp when night hit.