In L maps strong guards MP do you build second castle?
I foresee only a few cases I can build. If I am Necro and has second castle of fortress, I can build, replace zombies with Wyverns , and if I can get hydra it is extra ghosts for me.
If I have Stronghold I may build elves too since Cyclopse dwelling requires too much Crystal's when you have ancients.
Can you think of any cases where it's good to build? Of course dont mention the non sequitur if you have the same town it is always an option