Found him

As Mira and Gray entered Targaryen's retreat, they were shocked to see that it was in ruins on the inside than it was on the outside. The walls were cracked, there were papers scattered all over the floor, and any pictures were now faded and torn in their frames. Mira had entered cautiously, only to be rewarded with the door slamming instantly as she fully entered, submerging her in darkness. It was then that a candle had been lit and Mira and Gray were horrified by the man who lit it.

He was old and hunchbacked with a cane in one hand and the lit candle in the other. He was completely bald with missing teeth and wearing a strange blue robe. All in all, this man had clearly seen better days.

"It's good to see you, Mirajane Strauss and Gray Fullbuster. I see you found my old coin."Targaryen said in an iron cold voice.

"You know why we're here Targaryen. Just get my friend Gray out of my head." Mira said.

"But of course. I just need my coin. You have it right?" Targaryen asked.

Mira had pulled out the coin from her left dress pocket and handed it to Targaryen.

"You know its funny. I created countless fool-proof Soul Magic charms, but this one was unique. It gave the user a full experience in another person's body, without the vessel even noticing. The only way someone would notice if the person inside the vessel had enough history together. I take it you've known each other for a long time." Targaryen said as he began the incantation.

"By the power of your creator, I command you, RELEASE! Targaryen said in a loud booming voice.

As soon as he finished the incantation, Mira's body began to glow a bright blue and Gray's soul had shot out of her and safely returned to his waiting body at Porlyusica's tree house. As soon as Mira's body returned to normal, she asked Targaryen "Why did you do that so easily? I thought you wanted **** on Fairy Tail."

"When I was a young fool, yes. However, living the remainder of my life in exile, I realized how pointless it was to hold a grudge against someone who only wanted to help me. In the end I'm grateful, because I finally did my last good deed." Targaryen explained solemnly.

"What do you mean 'last good deed?'" Mira asked him worriedly.

"The drawback of Soul Magic is that it actually uses a wizard's own soul to power it. As a result, the wizard will eventually die an early ****. I didn't want to die knowing that my final act was an act of hatred, so I sent my first Soul Coin to Fairy Tail in the hopes that someone would find it. As luck would have it, Gray found it and because of that, I can die in peace. I can't thank you enough. Goodbye." Targaryen said as his body began to shine blue. His body had slowly dissolved bit by bit, until there was nothing left. Targaryen's final sensation was his Soul Coin that had disappeared along with him.

Despite everything he'd done, Mira couldn't help but shed a tear for the fallen wizard. Before she left, Mira found a heavy stone in Targaryen's backyard and slowly engraved in it with an old chisel. It took until sunset, but Mira had finished the inscription and made her way back to Porlyusica's home to get Gray, happily smiling.

In the stone was engraved 'Here lies Targaryen. A great wizard.'