Curse of Strahd
The Favored Soul is a variant of Sorcerer. Hit Points, proficiencies, saves, and skills are unchanged from the PHB (page 100).
The Favored Soul uses the Cleric spell list instead of the Sorcerer spell list for cantrips and spells. However, your spellcasting ability is Charisma not Wisdom. You may use a holy symbol in place of an arcane focus for your spells.
Chosen of the Gods
At 1st level, you choose one of the cleric class’s divine domains. You add that domain’s spells for 1st-level clerics to your known spells. These spells do not count against the number of spells you can know, and they are considered to be sorcerer spells for you. When you reach 3rd, 5th, 7th, and 9th levels in the sorcerer class, you likewise learn your domain’s spells that become available at those levels. You do not gain the ability to channel divinity.
At 1st level, you gain proficiency in light armor, medium armor, shields, and simple weapons.
Starting at 6th level, you can attack twice, instead of once, whenever you take the Attack action on your turn.
At 14th level, you gain the ability to sprout a pair of wings from your back (feathered or bat-like, your choice, or – if you follow a nature deity – dragonfly wings), gaining a flying speed equal to your current walking speed. You can create these wings as a bonus action on your turn. They last until you dismiss them as a bonus action on your turn.
You can’t manifest your wings while wearing armor unless the armor is made to accommodate them, and clothing not made to accommodate your wings might be destroyed when you manifest them.
Power of the Chosen
Starting at 18th level, when you cast one of the spells you learned from your Chosen of the Gods class feature, you regain hit points equal to your Charisma modifier (minimum +1) + the spell’s level.