Liekkiö is a ghost or a soul of a murdered child. Liekkiö didn't do any harm, but sometimes distracted travelling people by crying and whining. In some sources liekkiös looked like flames, similar to will-o'-the-wisps.
In his list of the ancient Finnish gods, Mikael Agricola described Liekkiö to be the lord of grass, roots and trees.
- "Lieckiö Rohot jwret ja puudh hallitsi ja sencaltaiset mwdh."
- "Liekkiö controlled grasses, roots and trees and other things like that."