Lamistard's memory is a book found during the Mahjarrat Memories miniquest. To find it, a fully charged Engrammeter must be operated inside Zemouregal's Fortress. When Lamistard's memory is brought to Kharshai, he transcribes it into the book.
It was not long after the death of Zaros that various interpretations of Zamorak's actions began to spread through our faction. Some said that he wished to rule, and that our rebellion was simply a political coup. Others claimed an ideological motivation, and of these it was the philosophy of chaos that gained the most traction. Zemouregal claimed that Zamorak was dedicated to chaos as a concept, and even that Zamorak was in some way an embodiment of the very concept of chaos. He preached with such fervour and impact that I wonder why Zaros had made him a Legatus and not a Pontifex. Although some of us were in contact with Zamorak during his sabbatical, he seemed uninterested in confirming any particular motivation, which Zemouregal took as further proof of his own perspective.
The details of this philosophy are well known amongst the Zamorakians and need not be repeated here. As more and more humans joined the rebel forces, 'chaos' became a rallying flag for them. Many came to us because they were fleeing or rejecting some aspect of authority within the empire, and a philosophy that prized individuality over structure, society or government was very appealing to them. In many ways anti- authoritarianism became a byword of Zamorakianism - an irony if ever there was one. Over time this developed into a very unhealthy anarchism, that said that any attempt to organise or cooperate or accomplish anything was reprehensible.
When Zamorak returned from Infernus with a vast army of Avernic demons in his thrall, the demons were quite compatible with Zamorakian philosophy. They had just finished a war of liberation against oppressors even more tyrannical than Zarosians, so not only was the spirit of freedom strong with them, but Avernic are fractious and disorganised beings at the best of times. The idea that these characteristics were a boon rather than a failing as the Chthonians and Zarosians had no doubt constantly taught them was eagerly accepted. Since the Avernic already ruled through strength, any lesser demon who might have preferred a more egalitarian philosophy had little to say on the subject.It was surprising how quickly things spread from there. Perhaps in imitation of the Zarosian or Saradominist churches, the humans in our faction began fabricating a mythology around our leader almost immediately. Zamorak did nothing to stop this, and even seemed amused by it. Before long we had rites and chants and holy books and mystical symbolism and all the trappings of a religion. Some of the other Zamorakian Mahjarrat bought into this, whether genuinely or just to fit in with the humans I do not know, while others like myself remained loyal to Zamorak, but not his cult.