If I have the unique neck to make me be able to summon Wolves up to my max companions does that not allow me to summon one spriggan? Are they separate or count together?
You can mix and match any type of companion with that amulet (or the Saftey In Numbers Node from the summon wolf tree) up to the total amount of companions you are allowed to have.
Obviously all companions that are not wolves can only be summoned once.
This basically functions in a way, that your Summon Wolv Skill will not become the “Howl” abiltiy of the wolf, until you ahve maximum companions.