While most lore is considered proprietary to the House that created it, two paths exist as tools that every angel (or demon) needed to further their work amid the wonders of Paradise. The Lore of the Fundament was the first, encompassing the basic building blocks of the physical universe, in effect creating a set of principles that provided the foundation upon which the work of all the Houses was based. The second set of common lore evolved among the fallen during the Age of Wrath as a means of facilitating contact between humanity and the rebel host.