Serpentbane

Forged by the royal armourers of Cormyr, Serpentbane
was first wielded by the famous Dragon Slayer,
Imrisk the Bold.
This magical maul grants +1 to hit and damage
rolls. Against reptilian creatures (including dragons
and dragonborn), this weapon does an extra 3d6
damage.
All adult or older dragons will recognise the
weapon - any social interactions are at
disadvantage.