Franmatlh's weak point is that he can tank all blows with souls.Hence,physical and magic attacks have no effect on him...But,if you use an souless object like a sword,or an overkill like a gigantic stone then it works...Without souls,he is quite a weakling.
Lucy is really smart.that bluff was really well done.Had Franmalth not ejected Taurus and Aries,he would be dragged to the dimension of the celestial spirits.She used that to trick him into releasing Natsu.
So,E.N.D was sealed.That explains why he isn't kicking asses here.But the question his,WHERE is he sealed...Is it on some kind of device or place close to the seal,like a book or room...or on a person?
if it is the later,I suggest Lucy and Happy to get the fuck away from where they are.Honestly,as long as Mashima does an outstanding job here,I am satisfied.i coudl care less if my hyphotesis is right or no.
yeah,there was something quite fishy.Face would negate all magic on the continent...but isn't Zeref a mage? E.N.D will probably respond this question.
Also,Lumen Historie.Guess we are soon gonna find out what it is."Fairy tail's light -and it's darkness". It probably is either a weapon or a really powerful (or important) device that supposedly is the image of fairy tail's true nature...