I think it's the newest and unique spell ever,,,introducing the "FORCE FIELD SPELL" put it on your troops during battle and turn your armies into untouchable target which creates a ring of sphere of shield that last for seconds just like freeze spell for a fair battle.It's time limit last longer when it upgraded to the next level....
It's a very simple idea on spells,but very effective on battle.I hope you add this spell to the very addictive game...thanks.