Every major sphere of human existence is in theory ruled over by the Gods, Divine entities of incredible power that reside within the Astral Seas. The realms watched over by a particular diety is determined by two distinct factorsics: the “intrinsic” and the “extrensic”.
Intrinsic refers to the God’s personality, goals, and interests. Much in the way some human being take great interest in playing a particular instrument, each God finds a particular pattern, theme, or motif within the mortal world to be enthralling.
Extrensic refers to the struggles for power. The mortal world and the astral seas are not immutable nor are they without some strife. Gods interested in particular spheres or even in the lives of great mortals contest between one another for dominance. There are theologists that claim storms, quakes, and other great natural phenomina are echoes of these contests.
In addition, each God is not alone in their domain. Select mortals are invited upon death to serve, others manage to ascend through trial or study to become minor dieties. These lesser gods may have but a fraction of a true God’s power, but are still immortal and far beyond most human potential. The activity of these lesser dieties and exarchs depends greatly on the God they serve and the realms they oversee. Lawful and good gods’ exarchs often contend with each other through peaceful contests or friendly duels while evil and unlawful dieties’ domains are often turbulent webs of lies, deceit, betrayal, and violence.
This allows Gods’ spheres to be ‘delegated’ to lesser dieties and exarchs. While most religious followers choose and worship one of the major Gods for a given request, and most honor and revere many of the Great Dieties. There are those with more esoteric knowledge who may choose to appeal to a lesser diety whose interests more directly align with theirs in a given circumstance.
For example, most farmers pray to Pelor for a good harvest, but a well learned cleric may appeal to Demater in the spring during a planting festival. This highly fluid and chaotic pantheon means different cultures may have different gods, different names for similar gods, have varied numbers for a given god’s single sphere, and ascension or destruction of truly minor exarchs is a not uncommon occurance.