With the addition of familiars, it opens up an entirely new aspect of the game. I'm going to discuss two different elements of familiars, Familiar Gear, Merging Pacts.
The first topic I'm going to cover is Pact Merging. This, in my opinion is by far the most important.
So let's create a scenario; let's say you have 3 Springs and 2 Spires, all of which are level 25. You would be able to produce 18 pacts at a time with a 60% merging boost.
You can also increase Merging speed with research in the Familiar section.
(The familiar Territe (Pact 1A) has a skill called Ground Breaker that increase Merging Speed, I suggest getting this familiar first)
Pretty self explanatory. I'll just post a screen of all the Merging Gear that can be used. You obtain materials for this gear from the Voodoo Shaman or Shaman packs in the store. (All except the Mystic Box which is from gathering different resource tiles)