From Homestar Runner Wiki
The Thatched-Roof Cottage is the dwelling of choice for many of the citizens of Peasantry. The peasants build them persistently, even though they are very easy for Trogdor to burninate. Rather Dashing used to reside in one of these cottages until it was burninated by Trogdor, an act which Rather Dashing attempts to avenge in Peasant's Quest.
The main objective of the game TROGDOR! is to step on enough peasants to gain the ability to burninate these cottages.