Well if a castle is immortal while a player is offline, everybody will just close the game when they are sieged. We need another "SiegeBlock" which will indicate that a player is attacking you. When you logg off and this block is placed in your claim, your castle remains destructible. Also you can only place a siegeblock once an hour, preventing players from placing another one after you destroyed their block. Next to the siege block you will be able to construct your siege weapons. So it is a tactical descision where you place the siegeblock.

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