Against the Unnatural
Against the Unnatural is a book written by Maester Vanyon. It contains certain proofs of dragons having existed in Westeros even in the earliest of days, before Valyria's rise to power. The work considers as far-fetched the claim that Valyrian bloodmages experimented with unnatural arts to create dragons.
- The World of Ice & Fire, Beyond the Free Cities: Sothoryos.