T4.2

A heavy, oily taste fills the air, the rotting corpse of a large rat sits in middle of the hall.

Searching the Floor
Perception DC 22: You observe a thin layer of sticky tar on the floor.

May burn the tar off, or make Acrobatics DC 20 to move across without being entangled in the tar, though at half speed.

If missed, target is entangled, and becomes susceptible to catching fire from any source of flame. If lit on fire, the tar burns intensely for 1 round; it deals 2d6 points of fire damage and is destroyed in the process.

From R4
''You leave the large room where the kobolds scheme and enter a long tunnel. It becomes warmer as you go and a foul stench fills the air.''

From R10
The warmth and stench from the previous room recede as you walk along and you hear some scuttling noises from up ahead