Each weapon and spell indicates the damage it
deals, such as 1d8 or 2d8. Roll the dice, add any
modifiers (including the ability modifier you used
to make the attack), and apply the damage to your
target. Magic weapons, special abilities, and so
forth can grant a bonus to your damage.
Now see Pre-gen character fighter archer he has Longbow damage of 1d8 ONLY
#2 Augury Spell
Each time you cast this spell
in the same day after the first, there is a 20 percent
chance (1–5 on a d20 roll) that you will get a false
reading. The DM makes this roll in secret.
20% is 1-4 on a d20 roll