Add gates to Citadels
Citadels would become much more useful if there were gates. Rn you have to block the way for enemy with units or spell torns. And way from the enemy side to the inner part of the citadel is quite short, so a destructible door would decide most of the problems (alongside with a little buff for ballistas). The size of gates might be similar to the current three tiles at the Citadel entrance. The amount of HP might be equal to three fences.