On this level I encountered a surge of power (named green jelly who fell to one frost bolt, carrying Ironfist).

I also saw "You shudder." when first entering, and "You sense a certain tension." when walking around.

Comically, the tension room and the trap room were one and the same:

Code:
You open the door. You are welcomed with lots of squeaking sounds. 
The rat squeezes past the giant rat. 
A spear barely misses the giant rat. 
The rat squeezes past the giant rat. 
A spear barely misses the giant rat. 
The rat moves into the teleportation trap. The rat suddenly disappears! 
The giant rat is blinded by a bright light. 
The rat is blinded by a bright light. 
The rat squeezes past the giant rat. 
The giant rat is zapped by a bright light. 
The rat is engulfed by some strange kind of purple radiation. The rat seems to be corrupted. The rat suddenly looks pretty weird! 
The giant rat nearly falls into a pit that opens beneath it. The rat nearly falls into a pit that opens beneath it. 
The giant rat moves across a loose stone.
You hear a "CLICK!". 
Suddenly a huge explosion engulfs everything!
The rat squeaks one last time before it is consumed by the roaring flames! 
The wererat squeaks one last time before he is consumed by the roaring flames! 
The giant rat squeaks one last time before it is consumed by the roaring flames! 
The giant rat squeaks one last time before it is consumed by the roaring flames! 
The rat squeaks one last time before it is consumed by the roaring flames! 
The giant rat squeaks one last time before it is consumed by the roaring flames! 
The giant rat squeaks one last before it is consumed by the roaring flames! 
The giant rat squeaks one last time before it is consumed by the roaring flames! 
The rat squeaks one last time before it is consumed by the roaring flames! 
The chaos rat squeaks one last time before it is consumed by the roaring flames! 
The giant rat squeaks one last time before it is consumed by the roaring flames! 
The rat squeaks one last time before it is consumed by the roaring flames! 
The rat is hit by a gush of water! 
The giant rat displaces the rat. 
The rat moves into the teleportation trap. The rat suddenly disappears! 
The giant rat moves into the teleportation trap. The giant rat suddenly disappears! 
The giant rat moves into the teleportation trap. The giant rat suddenly disappears! 
The rat moves across a loose stone.
You hear a "CLICK!".
Suddenly a huge explosion engulfs everything!
The giant rat squeaks one last time before it is consumed by the roaring flames! 
The giant rat squeaks one last time before it is consumed by the roaring flames! 
The rat squeaks one last time before it is consumed by the roaring flames! 
The rat squeaks one last time before it is consumed by roaring flames! 
The rat squeaks one last time before it is consumed by the roaring flames! 
Something on the ground melts away!
(About 3 rats survived)

From a unrelated pit trap, a pit viper dropped a spellbook of disarm trap, and there is also a ring shop on the level.

My most eventful level yet.