Druid: How many creatures?

The decription of the druid specialisation says “one (later three) creatures” but the perk says “3 additional creatures” wich would make 4 creatures without disturbing the other skills.

How many creatures are alowed before the other perks stop working?

You’re meant to have 4 creatures as a Druid. The sentence you mentioned is a typo since the cap was originally 3.