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1. MC's mom is Moon god 1st believer.
2. The Moon god felt guilty to MC that she lost her mom so he want to take her with him.
3. The Sun god gave his powers to the MC so she's immortal now.
4. Ice spirit is a god but he gave portion of his powers to the MC so he became weak and lost his godlihood.
5. The moon & sun aren't exactly enemies. The Moon god loves humans so he want to live with them but Sun god refuse this idea so he stole Moon's power. (Lover's quarrel)
6. Later on Sun regret this decision so he follow Moon in the human world.
7. The Sun god is actually the head priest, he's also the one who gave jewel eyes to the humans.
8. With MC's power she can cure the Moon god and restore Ice spirit powers.
In other words our MC is a demigod? She now possess god powers & protected by spirit. Additionally she has natural ability inherit from her tribe.