Poison - the preferred trap


So I have been reading about actual real life traps found in tombs and stuff. As one might suspect, much of this is rooted in pure fantasy. However, there were traps in some tombs that archeologists have uncovered. A pit trap in a pyramid, a 'room filling with sand' trap, and a crossbow trap. The most ubiquitous trap of all though is poison. Poisons of various types were applied to treasures or in the room as paint. 

Poison, use poisons.

map with rivers of liquid mercury