This is a supplement for A Sundered World: you will need to own it, or at least A Sundered Fragments: Races & Classes in order to get the most out of this (though the races, equipment, and companion rules can be used with basically anything, and you could always use the class moves for something else). Inside its 124 pages you'll get:
New race, class, and compendium class moves for everything in A Sundered World.
Four additional races, including the thulid.
A new compendium class, the divine harvester: kill invokers, take their shit, and gain access to their powers.
New weapons, spirits, and materials.
New gear, including t'pual hardsuits, mindtraps, alternative kytheran materials, and kytheran warframes.
New ship materials and features.
Actual stats for enthollows and jotuncases.
Six new magic items, each themed for one of the classes in A Sundered World.
Rules for companion characters (for when you want or even need something more robust than a hireling).