Source War of Immortals
Whether dead or simply missing, your patron has gone silent, and you can no longer hear its whisper. While other witches might find this silence disquieting and lose hope without direction, you embrace this new challenge. Without a governor, you can now realize the true potential of your magic by tapping into the connection you once shared with your absent patron. You are no longer bound by the your patron's desires; you are free to forge your own path.

Seneschal 1st

Your witch patron has gone mysteriously silent. You still have access to your abilities, and your familiar is still funneling your patron's power to you. As you learn how to tap into that power, you influence your familiar to mold the power by itself, continuing to learn new spells and provide you with other witch class features.
Without your patron watching over your power, you gain more control but also miss important lessons. You must select Seneschal Witch Dedication as your 2ndlevel class feat.
Prerequisites: You must be a witch who has lost contact with your patron.
Adjustments: Instead of your patron's lesson, you gain the manifest will hex cantrip and your familiar learns one common 1st-rank spell of your choice from your spell list.

Additional Feats

Source Player Core
Some archetypes include a list of “Additional Feats” that appear in other sources. The list includes each feat's level, which might be different than normal when gained from the archetype. You can take the feat as an archetype feat of that level, meaning it counts toward the number of feats required by the archetype's dedication feat. When selected this way, a feat that normally has a class's trait (such as the fighter trait) doesn't have that class trait.
Click here for the full rules on Additional Feats.