In the grimdark future of the Warhammer 40K universe space marines wear incredibly advanced power armour (the developers are British, so I have retained their proper spelling). The heaviest suits of power armor are the Tactical Dreadnought suits, essentially mounting vehicle weaponry on a man-portable platform. They also bear the Crux Terminatus, a powerful relic and award which wards the wearer from harm.
The Deathwatch rulebook contains additional options which have been converted as well.
This package contains the prefab, and an armor card.