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How do the rules define Damage Roll?
Example, a Hexblade Rogue hits and rolls damage for attack with
a short sword (1d6 piercing),
as a sneak attack (2d6 piercing),
while Hex spell is active on target (1d6 necrotic),
with blade coated with Serpent Venom (3d6 poison, save for half),
adding Valor ...