Blue crystal

So that the movement is random...

Well, if we're talking about several two-way teleporters with the same group, the AI will love to jump between them for hours. If you make a scripted portal, like in the previous map, the AI won't even go into it.
I think I'll add a couple of one-way portals to a few "dead ends," but thanks to them, the enemies will also be able to reach the player's castle faster.