A very nice job and something that really builds on the thematic concepts in DnD. If I had one nitpick it would be the lack of feature at the 3rd / 4th levels. Do they get attribute bonuses or the ability to choose a feat? Are their archetypes they can play that provide some bonus at the 3rd level?
However, even without those - a very nice job.
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So sorcerous origins don't get a feature at 3rd level like other subclasses (or archetypes), because they get them at 1st instead (like clerics). If I threw in an extra feature at 3rd and/or 4th that would make this pretty unbalanced. Keep in mind this will be applied to the sorcerer class, which gets metamagic at 3rd level and an ability score improvement at 4th (in addition to spell progression and more sorcery points).