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I like this. It looks like you did do the level 4/8 split. Seems a little level 1 heavy, but I don't think that's necessarily a bad thing. Maybe this is my 3x mindset screaming at me that it's horrible [I've seen WAY too many Base Classes and Prestige Classes homebrewed where people talk too much about the 'I would only ever take 1 level in this class'].
Well, like I said, these are designed for a setting where all PCs are human and won't be acquiring a bunch of magic items with powers--if I were doing these for general D&D, I'd do things a little differently. Probably ditch the first-level power and tone down the non-skill-related ability.
It might not be a bad idea to increase the damage of primal scream to 2d8 + Cha mod at level 21 in an attempt to make sure that people would actually use it [thanks everyone for pointing this out to me when making my own Heritages.]
Not a bad idea, thanks. Usually only at-will attacks get that, so I wasn't thinking about a damage increase--but since you can't retrain this power like you could a class encounter power, a little scaling goes a long way.
If you don't mind, at some point, I would like to modify this a little bit to fit my own Heritages so my players could have this as an option.
By all means.
It's a pity that Plane Sailing didn't actually stat up any of those multiclass heroic paths. Although... I could probably do something like that with my Heroic Heritages. Wouldn't be completely the same, but I could take the 8 different Power Sources and create versions to better focus in that Power or to be able to mix that Power with another Power [like adding Arcane energies to Fighter powers to create a basic Fighter/Mage type]. Will have to think about this later.
I'm thinking about doing the multiclass PPs for classes for the same game I made the heritages for--at the very least I'll be making one for wizards, since wizards are only available as multiclass characters in this campaign, and I liked the Spellscarred approach for Forgotten Realms.