While Aldwyn tries to stall for time when asked his favourite legendary battle, he accidentally references the Clash of Kailasa. All that is known to readers of this event is it took place on one of the mountains of Kailasa, and Kalstaff used weevil dust to defeat the enemy, presumably a sort of monster

Though it is unknown if the other two of the Prophecised Three and their familiars were present, if Paksahara was there this may have been when she discovered the Caves of Kailasa.