strength stacking

[12owlbears]

Would the +4 from a belt of giant strength, the +4 from a spell of bulls strength, the +4 from whirling frenzy, and the +2 from long tooth sifting stack?

[Urpriest]

Bonuses of the same type never stack. Read the spell Bull's Strength and the description of the Belt of Giant Strength and you'll see what type of bonuses they are. The others have no type, so they stack with everything but themselves.