Ambrosia: The Age Of Gods
A deity is a particularly powerful creature. The definition of what constitutes “powerful” enough is stricken by disagreement. However, it can be agreed upon by nearly everyone that any creature powerful enough to defend a city-state is a deity, for all intents and purposes. Deities define every aspect of Ambrosia’s society, politics, and daily life. They weave most magics wielded by mortals, excepting those of wizards and virtuosos, a few of whom may be powerful enough to be deities themselves. Finally, they decipher Fate— the powerful magic that determines the eventual result of most events of even minor importance. They are what make Ambrosia what it is, and your powers are tied inexorably to their own.
However, this does not mean that they cannot die, or cannot do wrong, or don’t act petty, or foolish, or do any number of very mortal things. Deities, even the most powerful, are very… erm… mortal. They can die, permanently, and a mortal warrior or assassin can do it. However, such an act would require great skill, luck, and the blessing of Fate. It does not occur everyday. More often, it is another deity, or a demigod, like you, that kills a deity. Such occurrences are international events, and can change the course of policies and rivers, if the fight is messy enough. Unfortunately for the peace of Ambrosia, such events are common and all too destructive. Just as mortal creatures rely on deities for many boons, they are oft struck down by the pettiness and conflict of their patrons.