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Highlights:

1) Early access level cap is 4
2) You will start in Avernus and try to escape it
3) Early Access date is September 30th
4) Early Access content is almost triple (possibly more) compared to Dos2 act 1
5) Rangers can summon familiars at level 1 as a cantrip and travel around the (unlimited range) map with it.
6) You can have a kawaii desu Intellect Devourer and Owlbear baby as a pet