I never once said there wasn't a wipe.
Prelude happens on release of game, (now old information which may have changed) a month after Prelude Year Zero begins.
{edit}Prelude is a chapter because it has a name set by developers.
Year Zero is a chapter because it has a name set by developers.
Anything set by players is not a chapter, but instead a subject within the current chapter.
* Prelude:
** Dawn of Exilium
** 191st Expeditionary Battalion Beginnings
** The Dark Hand of Valor Prelude Story
** † Templar † The Lawful Evil Tribe
* Year Zero:
** The request for time
** The understanding of numbers
** Requirements for the Sundial
** Construction of the first Sundial
* Mythic Dawn:
** ...