Make Fortress Assets use Protection Slots instead of being Auto-Invul; increase slots given via Rune Master equal to a single set of walls, 8 barracks, and 3 Divine Favor Statues.

• 堡垒不再是自动无敌的了，需要使用无敌保护位置，符文大师现在有相当与一套城墙，8个兵营，和3个祭坛的保护位置