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hey everyone I've played 40k off and on for the past ten years, but I'm new to Age of Sigmar. I had a question about summons. If I us the spell Raise Zombies does it cost me points to add them to my Army? Also if I cast the spell in my Hero phase and put them within one inch of a friend zombie horde, can they become one unit as per the rules in the zombie warscoll? Also if they can merge how would following movement phase work afterwords? Thanks.

Summoning Zombies does cost points (60 points per 10 zombies).
As I see it, yes you can merge a freshly summoned unit of zombies into an old unit as long as they're within 1" in the hero phase.

If you merge two units they still get a movement phase, just as one large single unit.
If you merge a unit with a another unit that was summoned this turn, I DO NOT think you get a movement phase. Because summoned units cannot move the turn they're summoned, so it's like you transfer over the keywords "Summoned This Turn" t the entire unit of zombies, even if only ~10 / 30 were summoned. The whole point is that they are now one unit and you don't differentiate that stuff anymore.