Limiting no. of heroes for player

[Xonora]

How do I do this? Like prevent training after the sixth.

 

[TomTTT]

You can keep track of it, simple as that:

• Trigger
  • Events
    • Unit - A unit Finishes training a unit
  • Conditions
    • ((Trained unit) is A Hero) Equal to True
  • Actions
    • Set HeroCount[(Player number of (Owner of (Triggering unit)))] = (HeroCount[(Player number of (Owner of (Triggering unit)))] + 1)

And now you can do whatever you want with it (destroy the Altar, or with a bit of triggering kill any other hero who pops out from the Altar, so on)