104-form timeships were the hypothetical next generation of timeship after the sentient and humanoid 103-forms. During the War in Heaven the cradle-engineers of the Great Houses believed that it would just be a matter of time until they evolved. On the Homeworld, there was an implicit understanding that no 103-form was as powerful as the one 102-form Compassion, and there was fear that recidivist 102-"genes" might be reactivated in 104-forms. (PROSE: The Book of the War)

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