Like all +2 weapons, the DM will add +2 to the AC hit when using this weapon but the damage bonus has already been factored into the damage wheel.
+3 Slayer Sword
Adds +2 to Strength (thus adding +1 To Hit in melee and +1 Damage with melee and thrown weapons)
Adds +1 To Hit on all attacks (melee, ranged, and spells cast from the character card which require an attack slide, but not scrolls) and adds +1 to Will saving throws vs. fear effects
Multiple castings of this scroll do not stack with each other. Furthermore, this scroll does not stack with the spell bless (cast from a character card.)
This scroll bestows its effects on the entire party,