As long as the casket is not in close combat, it releases the light of death. Cast like an incantation at power level 2D6 Effects every unit that can draw line of sight to the casket. 2D6+2 and subract the unit's Leadership, this is the number of wounds it takes with no armour saves. Distributed as shooting. Count as magical attacks. Roll separately for every unit that can see the casket.
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