User blog comment:EvanDude345rv5/Fairy Tail 356: Tartarus Arc Prologue/@comment-7418318-20131020091019/@comment-5580383-20131024161617

The Mountain was smaller than Lullaby whose only 200-300 meters at most, that was more of a hill. Lullaby is much weaker than Dragons who can dish out this power pretty easily.

What's established within Canon, this is how power goes in FT.

World destroyers: Zeref, Acnologica

Country busters: Probably E.N.D

Small Mountain Range/Island Busters:Saint Wizzards 1-4 powerscaling, Nine Ghost Gates powerscaling

Mountain busters: Dragons (Mother Glare,Altas Flame), Deliora

City Busters: Saint Wizzards 6-10(currently) Gildarts, Marakov, TS Laxus, TS Erza, TS Mirajane, Natsu TS LFD, Ur  going by feats

Town Busters: TS A rank mages powerscaling( Juvia, Gray,Wendy)Cana TS with Fairy Glitter, PTS S class mages, PTS Natsu Dragon Force,PTS Jura, Jose Peorla,PTS Jellal, Lullaby

Muilt Block busters : PTS A rank mages powerscaling ( mainly those who can keep up with Natsu) PTS Natsu, PTS Lucy using Aquarius and Loki, TS  fodder mages ( Max)

Building busters: Basically fodder level mages

Erza herself was stated to be able to rival Saint Wizards going by  dialogue from Jellal, Jose and even Laxus. This is further backed by the fact that she withstood and survived Jupiter Canon and still easily defeated Aira and  held her own briefly with Jose  despite being weakened and Jose admitted that the matchup would be more fair if she wasn't weakened by Jupiter Canon.

Also Natsu was powered up by Lullaby's flames it shot at it  and Gray's ice was strong against it's wood foundation and even then, they used a combination attack to take it  down.

Deilora was shown to be much stronger than Lullaby, even going the anime extended version of his feats considering his laser crossed several miles easily.

So overall Deilora>>>Lullaby