From publisher blurb:
An unforeseen consequence of various attempts by other powers to interfere with history, some sorcerers draw their arcane power from causeless effect. These sorcerers may be people whose origins were erased by time travel, or even people wholly displaced from their own time by changes to history. Whatever the case, originating from a sequence of events which defy conventional logic, these sorcerers’ spells may behave in strange or unpredictable ways, interacting with other sources of magic with an unexpected serendipity.
Building off of the existing Fifth Edition rules to build a sorcerer character, the Paradox Bloodline grants sorcerers chronomantic abilities, drawn from exposure to disruptions in time. This PDF also contains new metamagic options for all sorcerers to enhance their spells with some chronomancy flavor.