 The Spryggla were skilled architects.Lin Piao tells Michael a lot about the past, and how Humans were losing the war, until the Isomage was able to put up a final resistance which the Sidhe were unable to break, and thus fight them to an standstill and an uneasy, millennia-long truce.Lin Piao is very excited that he has a book containing the poem "Kubla Khan", because it is the first part of a Song of Power, and the Isomage had him build another part of the same Song architecturally.