They shook their heads. They said, "We've heard of them of course. But we have no clue how to do them."
"Right then, we'll start with that. Sort your stuff, sort by importance, irreplaceable stuff needs to be able to fit into something small I'll teach you a basic blood ward for that. Before you ask yes it's blood magic but it is one of the few blood magics that isn't illegal to use. Use it on a small box or if you're willing to spill enough of your own blood you might be able to seal a small trunk. You will be the only person able to open whatever you choose to seal." The rest of your stuff a locking charm will stop someone who's only trying a little. What I suggest ultimately is a locking charm with a prank to back it up. Something with a twenty four hour effect. That way you'll know who was behind it and can report that person to your Head of House. I can come up with a couple but they'll all take forty-eight hours or longer to prep for."
"That protects our stuff but what about us?" Blaise said.
"Draco falls into the protection of the House duSable. I'll notify Sirius when I get back to the dorm. He'll probably send some sort of protective amulet. I'm sorry and can't do that for all of you. What I can do, is teach you some self defense. I'm actually a fairly competent instructor for teaching physical defense. This may not mean anything to you, but I'm a black belt, in three disciplines of martial arts. Sirius also has me trained fairly far in defense magically already, something about as Harry Potter I have enemies." Harry's voice held a large note of self-mockery.."Meet me in the mornings an hour and a half before breakfast in that room on the seventh floor and I'll teach you some of what I know. It won't be easy. but I doubt you'll get a better offer.
Harry glanced at his watch, "I need to go talk to the elves in the kitchen, about Sunday but that can wait for a short time. I hope I'll see all of you there Sunday. Now for the blood ward." Harry pulled out a piece of parchment then he carefully drew out three separate runes, then he drew it again this time with the three runes atop one another. "This ward is pretty basic but it is one of the most effective out there. I want you to practice these runes. Then practice drawing them atop each other like I did here. While you practice, I'm going to go to the kitchens then I'll be back to teach you the rest."
After he left, Blaise looked at Draco. "I'm amazed. You said, but I didn't believe you."
"Harry looks at everyone and just sees people. He doesn't see House or blood status, he judges everyone based on the things they say and do. He knows enough stuff to put most Ravenclaws to shame but he's not one to trot out all he knows just to impress others. If anything he'd rather keep it to himself until it's needed. It's the only thing keeping him from being completely insufferable, he's such a goody two shoesand almost modest to a fault. One thing you should never do though, is call a muggleborn mudblood around him. My dad did and well the result wasn't pretty. His mum, who he credits with his survival of You-Know-Who's attack, was muggleborn and insulting them is in his mind insulting her. Although he had very good insight as to how that particular insult came about."
"How was that?" Tracey asked.
"I told you this two days ago. In Slytherin's era, muggles didn't understand sanitation very well and were mostly illiterate, Salazar Slytherin didn't like muggleborn because they had to learn those things before they could learn magic and given he liked ambition and cunning it wasn't a good fit. But enough talk, we should practice this."
"Right."
The five heads bent to their parchments.
Twenty minutes later Harry returned. "Okay. How's it going?"
They showed Harry their parchments.
"Good looks like all of you get it. Anyway to protect your boxes you draw the runes on each of the surfaces in your own blood. Then you bring up your magic and touch the runes to charge them." Harry felt frustrated when they looked at him with uncomprehending looks. He forced himself to remember that they hadn't had any of his training. He sighed, "Okay. I guess we should move to a class room for this, I doubt Madame Pince would like us doing it here."
Susan, Neville and Hannah were just coming to find Harry as he and the Slytherins were leaving.
"Harry, Professor McGonagall said okay, she even gave us two points for Hufflepuff and Gryffindor for coming up with it!"
"Cool."
"Where are you going?" Neville asked.
"We're going to a classroom so I can teach these guys how to pull up their magic and I'm going to teach the most basic locking charm. Want to come?"
" You can teach that?" said Hannah.
"Yeah." Harry's expression got self-conscious for a moment.
Draco, who had seen Sirius correct Harry for using what he called language laziness, snickered as Harry blushed then self-corrected.
"I mean yes. It was one of the first bits of magic I learned, pulling up magic I mean."
"Let's go!" Neville said enthusiastically.