Inside The Horus Heresy: Burning of Prospero boxed set you will find:
5 Custodial Guard
5 Sisters of Silence
Ahzek Ahriman (Thousand Sons Hero)
5 Tartaros Terminators
Geirgor Fell Handed (Space Wolves Hero)
30 Space Marines Legion Veterans with MK III Iron Armour
1 Chapter specific Transfer Sheet
A 32-page rulebook with all the rules and a 16-page book with the background story
A deck of 15 Psychic Power Cards
36 Warp energy and Willpower cards
5 reversible board tiles representing the buildings of Prospero
Gaming accessories such as assorted counters and 24 unique dice (D6, D8, D10, D12)