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Legend
You could go back to the original pantheon (well, not original but the arcane age version). These were their portfolios and I've included domains which I would probably use for them. Because the FR loves their world shattering events so much, you could even run a game during or after the gods fighting and merging, becoming a much smaller portfolio. You might still have a number of cults surviving as different aspects of the gods such as the churches of Gond, Oghma, and Mystra being separate branches of the new faith and having to learn to get along in the new cosmology.
- Amaunator - Bureaucracy, law, order, rulership, the sun
- Light, Order
- Jannath - Wild nature, forests, the seas, agriculture (and farmers and gardeners), the fundamental elements, summer
- Life, Nature
- Jergal - Death, the dead, order in death, funerals and tombs, undeath, old age, tyranny, dusk
- Death, Grave
- Kozah - Storms, destruction, rebellion, strife, ravaging beasts and monsters, ocean storms, conflagrations, earthquakes
- Nature, Tempest
- Moander - Rotting death, decay, corruption, parasites
- Death
- Mystryl - magic, spells, the weave, creativity, knowledge, invention, song, time, spring
- Arcana, Forge, Knowledge
- Selune - moon, moonlight, stars, dreams, purity, beauty, love, marraige, navigation & tracking, wanderers, diviners, good/neutral lycanthropes, autumn
- Life
- Shar - Dark, night, hatred, loss, sleep, nightmares, illusions, lies, trickery, secrets, betrayal, seduction, thievery, murder, winter
- Trickery
- Targus - War, skill-at-arms, duels, berserkers, plunder
- War
- Tyche - Fortune, luck, fate, misfortune, accidents, accountability, adventurers, explorers, trade
- Trickery