From publisher blurb:
Join the titular Infinity Guard, a reclusive organization set against the backdrop of the Timeless Expanse, a chaotic demiplane outside time where the phyics and magic do not obey the normal laws. Journey across a place filled with dangerous extratemporal monsters or tackle missions throughout points in time to prevent the paradoxical collapse of the world.
You'll find the following within this compendium's 32 pages:
4 pages of lore for the Timeless Infinity, a demiplane outside time, with rules for traversal and several warping locations.
6 pages of lore for the Infinity Guard who protect the prime temporal stream from extratemporal threats.
4 pages of rules to facilitate a time-traveling adventure without headaches.
1 warlock subclass: the Timeless patron who exists outside of time and grants you a sliver of their chronomancy magic.
20 items: from the reality-tearing Vanishing Point to the infinitely spiralling Fractal Coil.
2 monsters: from the incomprehensible chaos fractal to the illogical chronal paradict.
24 adventure hooks to kick off a game set around the Infinity Guard or time travel.