This weapon affects all creatures and objects within a radius of X meters from the point of impact.
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Measure the radius like movement: each tile is 1m, and every second diagonal tile counts as 2m. AoE 1m is a 3×3 square. AoE 2m is a 5×5 square without its four corners.
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See AoE Attacks and 💣 Explosives Attack for full blast resolution rules (damage application, Cover attenuation, Average DT, and the 1/6 💔 Cripple Threshold split).