There's 2 ways of doing thisyeh i get it ^^
But also need timed waves thats a bit more tricky i guess
Also if the building they spawn from is destroyed they stop spawning
Just add the event "Time - Every 20 seconds", and then "If"s for all the buildings, checking if the building is alive... If so, then spawn units
- AI - Ignore (Triggering Unit)'s guard postion