A similar building like the hidden tesla which can be rearmed with spells mayb mini spells(one space each,not dark spells) for eg: when trap is rearmed with lightning spell,it will do extra damage to attacking troops;healing spell will heal the defences in a particular range ;rage spell will rage up the defences ;jump spells makes defences keep jumping up and down so that defences will take extra time to break a building ;freeze spell freezes attacking troops and allows defences to target them!! Btw allowing this idea will have to increase attacking time allowed for war and multiplayer!!
Use spells as traps to defend base
