Question if anyone knows.

I am looking into a Build idea. But i cant remember if its a Gem or an item or if a few months ago i saw something different then what i am thinking.

Is there a New gem or Item that has you summon minions that dont fight but you can kill to get Procs from weapon effects or proc effects from tree's?

I cant remember if this is a thing or no.

Anyone able to help me out with this?

animate guardian?

You mean this one?
https://www.poewiki.net/wiki/Raise_Zombie_of_Falling

sadly no. I thought there was a Gem or item or something in the tree that lets you summon minions that you can kill to help get stacks or Procs. Thought i saw a Demo video from GGG about it and they had a Bone shatter build in the gameplay. I remember thinking that be amazing to quick build Bone shatter stacks for bosses.

Could it be one of the marks from the wildwood ascendancy?
That summons hostile phantasms

You are talking about The Writhing Jar, a potion that summons 2 worms that you kill in order to "start up" a bunch of builds.

Perhaps one of the most popular usages is for summoning spiders via Arakaali's dagger. But there are a bunch of others that use the worms in creative ways.