
Trymon knows there is no point in deposing the Archchancellor until he learns how to control the Octavo, which is growing increasingly restless as Rincewind (and the spell in his head) moves further away from Ankh-Morpork and into greater danger. Rincewind and Twoflower are eventually washed rimwards to the kingdom of Krull, which lies on the very rim of the disc, where they are taken prisoner. The astronomers and "astro zoologists" of Krull have for many years attempted to determine the sex of Great A'Tuin, and are on the verge of launching a space vehicle to carry a pair of "chelonauts" on a new mission over the rim of the disc. Unaware of this, Rincewind and Twoflower take the place of the two chelonauts and 'escape' to the spacecraft, which they accidentally launch, catapulting them off the rim. The prospect of losing the eighth spell in this fashion prompts the Octavo to act, causing A'Tuin to perform a barrel roll to recapture Rincewind, landing the pair near the centre of the disc. Watching the Octavo's restlessness, the Archchancellor reveals his intention to use the Rite of AshkEnte to ask Death about the Octavo and also about a large red star that has recently appeared in the sky.
