I would like to prevent Gigas from spawning just like you prevent the Wyverns from spawning to prevent crashes when killing them. It's not that the gigas cause a crash, or at least I don't know because I haven't managed to kill one but there is an overpopulation issue with them on my server. I have at least 8 just in the vincinity of my base.
I expect it to be something like but I'm not sure or know where to look up the syntax/dino name used.