You can turn nearly any object into a deadly weapon, from a razor-sharp chair leg to a sack of flour.
You do not suffer any penalties for using an improvised weapon. Increase the amount of damage dealt by the improvised weapon by one step (for example, 1d4 becomes 1d6) to a maximum of 1d8 (2d6 if the improvised weapon is two-handed). The improvised weapon has a critical threat range of 19–20, with a critical multiplier of ×2.
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Sources:
SECTION 15