It was accidentally started by the Confluence in a failed attack against the Unseen. Waterdhavian guard patrols got involved when they spotted what they thought was a group of evil will-o'-wisps in the blaze. They engaged the wisps but did not realize that the group also contained some similar-looking nyths, which explosively reproduced in fire. The Waterdhavians killed the wisps but two guards were lost when the nyths began to reproduce.