[Stormbinder]

Originally posted by Cohen:
The problem isn't only to defend your temples:

Castles in every province raise gold by admin.
Doubles production everywhere if you need.
Protects your mages researching inside.
Protects your troops from Ghost Rider spell and similar.
Slow the enemy conquer of your territory, giving them 1 turn more to trapeze/teleport their army sllaughtering SCs there.

Probably I'm forgotting something.

Logically speaking, to solve the mad castling issue there are only 2 possible ways - you have to either made building castles in 100% of your provinces impossible due to game mechanic/rules, or/and you have to make it unprofitable. Each of this approaches could be implemented by several different methods.