Warlock 2024 Phbi. Warlocks also get the most powerful damage cantrip. A warlock could have gained the basic level 1 and 2 warlock abilities from their own research into the occult, coming across an item that instilled eldritch understanding, or worked their way up.
Venomous snake used to be a general find familiar. Thanks to mark hulmes, we have a preview of the great old one warlock subclass for the 2024 phb.