
avr |

This was the subject of a little dispute between us. The actual archetype name is Dreamstalker, Somnomancer is the name of one of the class features which that archetype gets.

Cevah |

When do I count as having a class feature?:
You have a class feature when your class description tells you you gain that class feature, generally based on your level in that class (and perhaps altered by factors, see below).
If you have an archetype or other rules element that replaces that class feature, you do not have that class feature. For example, if your archetype replaces a rogue's sneak attack, you no longer have the sneak attack class feature (whether a requirement is as general as "sneak attack" or as specific as "sneak attack +1d6," you do not qualify for it).
If you have an archetype or other rules element that replaces part of a scaling class feature, or delays when you get that class feature, you do not have that class feature until you actually gain that class feature.
Example: If you have a fighter archetype that replaces weapon training 1 (but not weapon training 2, 3, and 4), you don't gain the weapon training 2 ability until fighter level 9, which means you don't have the weapon training class ability at all until you reach fighter level 9. Anything with "weapon training" or "weapon training class feature" as a prerequisite is unavailable to you until level 9.
Example: If you have a cleric archetype that replaces channel energy at level 1 (but not later increments of channel energy), you don't gain the channel energy ability until cleric level 3, which means you don't have the channel energy class feature until you reach cleric level 3. Anything with "channel energy" or "channel energy class feature" as a prerequisite is unavailable to you until level 3.
Example: If you have a witch archetype that replaces your hex at level 1 (but not later hexes, major hexes, or grand hexes), you don't gain your first hex ability until witch level 2, which means you don't have the hex class feature until you reach witch level 2. Anything with "hex" or "hex class feature" as a prerequisite is unavailable to you until level 2.
If you have an archetype or other rules element that replaces that class feature, you do not have that class feature. For example, if your archetype replaces a rogue's sneak attack, you no longer have the sneak attack class feature (whether a requirement is as general as "sneak attack" or as specific as "sneak attack +1d6," you do not qualify for it).
If you have an archetype or other rules element that replaces part of a scaling class feature, or delays when you get that class feature, you do not have that class feature until you actually gain that class feature.
Example: If you have a fighter archetype that replaces weapon training 1 (but not weapon training 2, 3, and 4), you don't gain the weapon training 2 ability until fighter level 9, which means you don't have the weapon training class ability at all until you reach fighter level 9. Anything with "weapon training" or "weapon training class feature" as a prerequisite is unavailable to you until level 9.
Example: If you have a cleric archetype that replaces channel energy at level 1 (but not later increments of channel energy), you don't gain the channel energy ability until cleric level 3, which means you don't have the channel energy class feature until you reach cleric level 3. Anything with "channel energy" or "channel energy class feature" as a prerequisite is unavailable to you until level 3.
Example: If you have a witch archetype that replaces your hex at level 1 (but not later hexes, major hexes, or grand hexes), you don't gain your first hex ability until witch level 2, which means you don't have the hex class feature until you reach witch level 2. Anything with "hex" or "hex class feature" as a prerequisite is unavailable to you until level 2.
This FAQ sort of relates.
You are given a specific hex, and the option for several later.
Absent anything clearer, I would say you can get Extra Hex.
/cevah