How a God Can Die (GAP)

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There are essentially two means of demise for a power, though the first is so unlikely as to be barely worth mentioning. The second occurs far more commonly but is also more sobering and sad. Nevertheless, it contains a great truth about the nature of all things.
==By the Sword==
It is possible, but just barely so, that a power can be slain by violence. The might required to do so rests only in the hands of the powers themselves, and even still, killing one of their own is a nearly impossible (not to mention unthinkable) task. Most would never consider it because of the danger involved. Gods fight, doing battle and waging wars about which great songs are sung and poems are written, but rarely do they actually slay one another.
Such a task entails more than just simply piercing a power's heart with a blade — these aren't fragile mortals, berk. Divine might is required to quench divine life. A power's got to be willing to expend (temporarily) much of his energy to end his fellow's life. Moreover, he's got to risk immortal combat, where he's in as much danger as his foe (in the whole scope of things, any and every power's a terrifying opponent).
A power who has slain another remains weak for many years. He's also risked the wrath of his victim's kin and comrades; many of these are also powers. Thus, most powers do not willingly attempt to slay one another. Plenty of other ways that gods can harm each other exist (through their followers, their sphere of influence, their realm, etc.). Only the most terrible transgressors among the gods are slain by their peers. Moreover, this is usually done by a number of other powers who've deliberated and finally banded together to end their fellow's existence.
'Course, some say that even a mortal can send a power to the dead-book if he knows the dark of it. Such talk is just screed, surely. No mortal blade's ever been forged and no spell's ever been spoken that can inflict harm upon a god.
==By Loss Of Faith==
Far more commonly (though it's still very rare), a power will die a slow, undramatic death. Her demise will be brought about as her worshipers' faith wanes and mortals cease to believe in her or what she represents. Some folks say that a power is merely the sum of the beliefs of her worshipers. The mortal followers of the god sustain her and give her life. This certainly appears to be true, because no worship means no deity — there're some floating gods on the Astral as proof.
Long ago, a power by the name of Phissanol had followings on two major prime-material worlds and a realm on Arcadia. She was a goddess of the full moon, and the light and safety that it brings in the void of night. One of the prime worlds was destroyed in a terrible celestial holocaust brought on by the wrath of other powers in Phissanol's pantheon. Phissanol's luck worsened from there, as her worshipers on the remaining world began to forget her. Try as she might to make her presence known, her worship declined and her followers turned to other powers or other concerns. Through magic or ordinary fire, they could bring their own light into the night, they claimed. Slowly, Phissanol's power began to wane. As this happened, her remaining priests lost their granted abilities and spells. They, too, began to leave her service. Over the centuries, these effects continued to worsen as a snowball grows rolling down a snowy hill. Her might and influence decreased as her followers abandoned her, and more and more stopped worshiping her as her powers lessened. Slowly, pitifully, Phissanol faded away. Her realm receded and decayed, eventually becoming a vast wasteland. Phissanol fell into a deep sleep and faded away entirely. The Astral gained another floating island.
Obviously, this is no small matter. A power tries to keep her followers at any cost. Nonetheless, belief isn't something that a body (even a power) can force on someone. It doesn't happen often, but sometimes circumstances will eliminate the deity's followers or their faith. This sort of "death" takes centuries, however, as most powers have literally millions or billions of followers on multiple worlds and planes.