Summary:
The Forge Domain ability, Deafening Clang, replaces Bless Weapon's "vs undead" damage with "vs construct" damage, but Bless Weapon can be applied again to get both.
Expected Result:
- Cast or use Bless Weapon scroll.
- Cast Forge domain ability.
- Both remain.
Actual Result:
The Deafening Clang "vs Construct" damage bonus will replace the Bless Weapon's "vs Undead" damage bonus. You fix this by... recasting Bless Weapon afterwards.
Screenshots attached: