From Tar Valon Library
Dragons are large metal tubes, crafted by bellfounders to launch exploding balls called Dragon Eggs.
Aludra, one of the last, if not the last Illuminator after the destruction of both chapter houses, was looking for revenge against the Seanchan. She found Mat while fleeing from other Illuminators, and in return for her rescue, she gives him some of her fireworks as payment. Later, while travelling with Valan Luca's Circus, she and Mat plan the making of several cannon like, metal tubes, that will fire Dragon Eggs. (INCOMPLETE)