A small green glass bottle with a cork stopper. Inside is swirling green smoke. When the stopper is pulled, the smoke pours out and takes the form of big troll that stomps around, bellowing and waving a club. But it is just an illusion, can only distract but not do real damage.

Yarwick the Torpid is a halfling hedge wizard who lives in The Dale and rides around with house on top of a large turtle. Yarwick makes a lot of these "illusions in a bottle," of all different types of creatures, and often gives them away to friends or while gambling (Yarwick loves to gamble).

However: Yarwick is a very forgetful guy (he smokes too much of the Halfling Leaf) -- so there is always a small chance that he accidentally grabbed the wrong bottle, and gave you something different: Yarwick's Real-Troll-In-A-Bottle -- in which case, when you release the smoke, you aren't dealing with a fun illusion -- but instead, a REAL TROLL....and it is pissed off.....(DM's choice to make this happen)