Some weapons unleash salvoes of shells that blanket a wide area, wiping out entire platoons of infantry and squadrons of small vehicles.
This blast template is necessary for the sort of massive weapons wielded by Titans and Super-heavy Vehicles. Use them in your games of Warhammer: The Horus Heresy to determine how many models are affected by the blasts, as laid out in the rules. This clear plastic template is formed from four 5" blast templates laid in a clover shape, with a fifth filling in the middle.