Certain epic or divine effects exist beyond a spell's influence. A spell typically covers mundane, normal rolls - attack, chances, save rolls - where normal magic applies. However, when a target faces truly cosmic or reality-bending forces, the DN can rule that even powerful spells fall short.
For example, image a magic that lets you reroll a missed sword swing, a failed poison save, or a botched climb check. But it won't override a god's word, the collapse of an entire plane, or a fate-sealed effect woven into the campaign itself.
DN Guidance: Use the Divine Effects preserve the weight of truly momentous events. Let spells shine against ordinary challenges, but reserve divine and epic effects as narrative anchors that can't be casually overridden by mid-level magic.