Divine Bonus

An Divine bonus comes from a spell which provides a bonus to one or more things (skills, to-hits, armor class, etc.) which was cast by an divine caster, and lays a charge. Divine bonuses do not stack with other divine bonuses. In the unlikely event that more than one bonus is available to the same action or attribute, only the highest available bonus is used.

A divine bonus does stack with an arcane bonus (as well as any other bonus type, other than another divine bonus), unless the effect being placed upon the target is coming from the same spell as the arcane bonus. This means you can benefit from a buff spell cast by an arcane caster and a different buff spell cast by a divine caster at the same time, even if both spells improve the same attribute (such as armor class), unless both spells share the same name. (Note that 'same name' excludes the parenthetical in the page title, meaning that "Invisibility (Spell)" and "Invisibility (Poultice)" are considered the same spell for this purpose.)