Sewyrm was the name for a type of lizard that dwelt in large numbers in Waterdeep's sewers.
Sewyrms were a mottled "lettuce green" color. They were about the size of a mastiff dog.
The tail lash of a sewyrm was worse than its bite.
- ↑ 1.0 1.1 1.2 1.3 1.4 Steven E. Schend (September 2008). Blackstaff Tower. (Wizards of the Coast), pp. 31–32. ISBN 0-7869-4913-9.