A/N: This is my first fanfic on this site ever! This will be a Harry Potter/ Terraria xover, so expect elements from Terraria, and OP!Harry. Sorry, if this isn't your cup of tea, but whatever.

IMPORTANT: I expect that you have played Terraria before, and read the HP books, because there will be a lot of spoilers.

Disclaimer: I do not own Terraria, or Harry Potter. I wish i did though.

Chapter 1: The Descendant

Harry Potter had just arrived at his vault. He had thoroughly enjoyed the mine cart ride down to his trust vault. Hagrid had left though, saying he needed to do Hogwarts business. Harry enjoyed watching the vault door open, but the things inside was the best part in Harry's opinion. There were mountains of gold, and various items. The thing that caught his eye the most was the crystal that was on a pedestal. It was purple, and shaped like a star.

Harry strode over to it, and admired the color. It was about as small as his fist. He was entranced with it, and reached out to grab it, but instead it disappeared into dust, and flew straight at him. He fell back surprised by it, but then promptly passed out, as the dust combined with him, and funneled knowledge into his head.

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Harry woke up several minutes later. He remembered about the crystal thing. The mana crystal, his mind supplied. He was surprised; as he was sure he had not known about it previously. It had filled his mind with a vast amount of knowledge. He know knew that it was meant to only increase his magic capacity a little, but instead, a hero of old, known as the Terrarian, had pumped it full of its own magic, and all of its knowledge.

Harry now knew that the hero defeated a being known as Skeletron, a being that gave even Merlin trouble. He knew that he defeated the eye of a god. He knew that he defeated the guardian of hell, the Wall of Flesh, and unknowingly released spirits of light and dark onto the world. He knew of the three beings made of metal, Skeletron Prime, the Twins, and the Destroyer. Harry now knew that the hero even defeated a plant god of sorts, and a god of humanity's own making.

Most of all though, Harry now knew that the hero defeated a god, and the person who summoned the god. Harry now knew of all the adventures of his ancestor, and of the magic his ancestor had cast. They were in tomes located at the bottom of Gringotts, in the most secure vault in the bank. His ancestor had made a contract with the goblins long ago that his heir would be able to access it no matter what. In that vault contained the tomes his ancestor learned from, the glove he used to store his weapons, and the legendary blade, the Terra Blade.

Harry soon snapped out of it and got right back to business. He wanted to follow in the footsteps of his ancestor, and the best way to do that was to learn the magic they used, and to use their own blade. He watched his ancestor's battles, so he was sure he could use the blade. Harry quickly gathered up 66 galleons, and left the vault. He then went up to Griphook.

"Um, I would like access to the vault of my ancestor, and as the contract states, I will be able to enter it now." Harry said nervously. Surprise flickered over the goblins face before returning stoic.

"Very well, get into the cart." The goblin said. Harry quickly scurried over, before hopping in. The goblin then pulled the lever, and soon they were off, going deeper into the bank, before reaching a very hot point. Harry was sweating up a storm because of the heat.

Soon, they came to a stop, in front of an ordinary looking door. Harry knew that there was a bunch of traps set up in front of it, and Harry knew the way to stop them. He then walked over to the wall directly to the right of the door, and pressed his hand to it. He channeled magic into it, and soon many runes started lighting up. He stepped back, and walked over to the left of the door, and then put his hand on the wall again. He felt several drops of blood drip out of his hand, as more runes started to glow. Then, he walked over in front of the door, and a light was shot at him. After several moments, it disappeared, and he simply walked over to the door, and pushed it open.

He stepped into the room, and his eyes quickly scanned the area. There were bookshelves to the left of him. To the right of him were many sets of armor. In the middle of the room were the Terra Blade, its scabbard, and a glove next to it. He immediately went up to them, and picked up the scabbard and glove first. He slipped the glove onto his hands, and felt it pulse with magic slightly. He picked the Terra Blade up, and put it into the scabbard. Soon, the sword pulsed, and Harry felt a connection with it. He shrugged it off for the moment.

Harry soon walked over to the bookshelves, and found many tomes. He was looking for the ones about the glove, how to wield a sword (he was sure he could wield one, but one couldn't be too sure), and the book of magic his predecessor had written. It contained many powerful spells, and he had seen them first hand. He wanted to cast them with his own magic.

He had spent one hour sorting through the many books, but soon found the three books he wanted. The one Harry jumped at was the book of magic. It had taken him the longest time to find it, but he persevered. Harry opened the book of magic first, and the first spell he came across was known as the "Water Bolt." It explained that all he had to do was imagine a ball of water flying out of his hand, but it had to be enforced by his magic. Harry spent two hours, and had only managed to put out a small ball of water, but it didn't go anywhere. It just fell on the floor. He was frustrated. He knew the spells would take a long time to perform, but he was getting impatient. It will be worth it, he told himself, it will be worth it. Harry repeated that as a mantra to keep himself going.

A/N: WHOOOO! First chapter down. Many more to go. Anyways, if any of you liked this, pleases favorite, follow, and leave a review. I am also going to put out there that if any of you would like to rewrite this chapter or any other, PM it to me, and I'll see if I like it. Anyways, see ya later!