Quote:
Righteousness:
You gain the benefits of Benediction on a Hero, Benediction on a Weapon, and Benediction on Armor. ...
Quote:
Benediction on a Hero: The spell bestows upon the Hero the blessing of +1 to all Might Action and Damage rolls.
Benediction on a Weapon: The spell bestows upon the weapon the blessing of +1 to all Damage rolls made with that weapon.
This seems pretty clear. The damage does not stack. But the Hero Benediction means if you switch to a secondary weapon, you still receive the +1 damage (it doesn't say it's only for attacks that use Might for damage) also the +1 Might can be used for things like Athletic Skill rolls.
To anyone who says "but what's the point of having Benediction on a Weapon if it doesn't stack?"
The answer lies in the rest of the spells.
Quote:
You may, at your discretion, replace one of the three benedictions above with your Deity's benediction.
Keep Hero and Armor replace Weapon.