Usual disclaimer: I do not own fairy tail nor am i making any profit from this.
'thoughts'- means somebody is thinking these words
"speaking"- means they're actually saying it
Preparing to be the S-class wizard: Mystogan
Fiore fairy tail Guild hall
"If you are going to impersonate Mystogan, you will need to learn his magic" Macao said. "I know, I was hoping you could help me with that." Jellal replied "Lucky you, Mystogan left all his notes, grimoires and reserve staves, and outfits with us in a storage room. Come along." Macao said as he led him deeper into the building.
In a dusty storage room they found packets of staves, neatly sealed in groups of five with a spare bandolier attached. A number of books, scrolls, loose sheets of paper and a few outfits were also in the pile. "This might take some time" Jellal said quietly looking at the mess. Macao returned carrying a pile of books. "Here these contain all of your heavenly magic spells as well. We have a pretty big library with magic books. Urano Metria is in there as well. Have fun." Macao said with a smile as he left.
Jellal groaned and got to work. Hours later he sat groaning at the bar, completely decked out in Mystogan's outfit. Taped shins, ragged cloak, odd pants, sandals, tight body suit, scarf and bandana with a metal plate. "No sleeping magic today?" Wakaba called out from a table. "No, I bonked my head, got memory loss, and am currently relearning magic and taking easier jobs to get used to things again. I am also trying to be more social." Jellal replied, stating the official cover story.
Lots of time later
Jellal had been going at it for months and now he finally understood the spell his counterpart had left behind. "So because he had no magic he used the magic saturated air of earthland to power his magic. That explains the air magic, it would be easy to manipulate the magic in the air to affect the air. This way he would never run out of magic power, quite ingenious. Mikagura(sacred song)!" he cried. The five magic circles appeared on after another and shook the ground with the force of his beam. "too slow, and weak. Mystogan could do all five in one instant allowing a much more powerful attack."
Again, a later date
"Macao would you tell me if I am doing this magic right." Jellal asked. "sure, why not" Macao replied as they headed outside. "Mie Maboroshi: Sora ni fureru, Āsu ni Shōgeki (Triple illusion: touch the sky, crash to earth)" Jellal intoned. Macao screamed like a girl and fainted. Jellal snickered. That would teach him to turn his outfit bright pink and orange with harts.
Winter
The grounds outside Fairy Tail were a battleground as the Fairy Tail mages fought each other in an all out war. A snow ball war that is. Or rather it was Jellal using his newly trained air magic to shape and condense snowball and launch them while keeping a barrier to deflect incoming snowballs. "Pāpuru Furea: Nadare(Purple flare: avalanche)" Macao cried as he used his magic to lift a large snow boulder and throw it towards Jella, and punching it with his magic so that it became multiple smaller projectiles. Jellal smirked and started shooting them down with quick beams of purple energy.
"Kemuri no mahō: Yuki no danmaku (Smoke magic: snow barrage)" Wakaba said appearing behind Jellal and ,using his smoke, launches lots of snow at him. Jellal shimmered and vanished appearing above them condensing falling snowflakes and launching them as small pellets at the two mages.
Spring
'Time to take a job or two before going on an s-class one.' Jellal thought. '200 000 jewels to stop bandits. They fly in using lacrima powered airboards and snatch livestock. Perfect' Jellal grabbed the request, checked it out with Kinana, and left Magnolia flying south once he had left the city. Half a day later he landed at a large farm/ranch containing lots of cattle, sheep, chickens, pigs, and crops. A gray haired man greeted him and told him to wait. Around noon a bunch of rough looking thugs rushed in and started grabbing poultry. Jellal was in the air in a flash and sent them crashing down either by punching or kicking sending compressed blasts of air at them, creating craters.
He touched down once the sky was clear, briefly placed one of the conscious ones in an illusion and got the location of their hideout. He tied them up and left them sitting and lying down among the cows. Jellal came to the hideout where he was met by a silver haired woman. She looked a bit thin, was dressed in a grey skirt and had bandages around her sizable chest leaving her stomach, shoulders, and arms bare.
"Who are you?" She demanded. "Mystogan, I'm here to clean out some bandits." Jellal replied quietly. "Mystogan? Sounds familiar, but I don't seem to remember. Can't be that important. I am Eriko, Erigor's daughter and apprentice. I will kill you now." She said smiling sweetly and grabbed a large scythe and swung it sending out a cutting wave of air.
Jellal easily flipped over it and launched a beam at the scythe with his fan staff (the one he usually has in his hand). The scythe got blown away and suddenly Jellal was there and sent Eriko flying back into the cave. "Why you ... emera baramu (emera baram (its one of those big tornadoes Eligor shoots))" She shouted angerly and launched a dangerous twister of cutting winds down the tunnel from her crossed hands. Jellal vanished into mist just as the attack was about to hit. Eriko laughed, thinking her attack had ripped him to shreds because he could not dodge in the cramped cave. Jellal appeared behind her and gave a quick chop to the neck knocking her out cold.
He tied her up and placed magic restraining cuffs on her. Further into the cave he came upon a cow, three chickens and a pig. He put them to sleep, and brought them out, and the girl too. Back at the farm. The farmer was holding a list. "Just craters, not too deep, no fire, or collapsed structures. On the list the council distributed you rank as level one terrain damage, which is excusable. And here I thought Fairy Tail was destructive." The farmer said. "Actually our destructiveness is relative to the maturity of the mage and the ability of the opponent." Jellal said quietly as he took his pay and headed back to Magnolia.
As he flew he reflected on how easy it had been, maybe he should try an s-class request?