Stacking Effects: Spells that provide bonuses or penalties on Attacks: Some spell descriptions refer to attacking. For instance, attack rolls, damage rolls, saving throws, and other attributes usually invisibility is dispelled if you attack anyone or anything while under its effects. All offensive combat actions, even those that don’t do not stack with themselves. For example, two bless spells don’t give damage opponents (such as disarm and bull rush) are considered twice the benefit of one bless. Both bless spells, however, continue to act simultaneously, and if one ends first, the other one continues to operate for the remainder of its duration. Likewise, two haste spells do not make the creature doubly fast.
