Once he got the basics of making light and fireballs with his symbology, Harry started researching other known cultures for more symbols and icons to consider combining to create the different ideas he got inspiration from the fantasy books and comics. The teacher at the camp was quite amused when Harry asked for any books he could read from and decided to loan him two books alongside a list to search from. Harry consumed the two books in record time and started to play around with his etching tools. Harry noted that whatever he had planned depended greatly on the type of symbols drawn along with the medium being used to hold them. For one, he should not use symbols representing fire or ash on flammable items, or use those representing power on wood as those would break or burn instantly with explosive results. He also needed to be very careful with the wording of his symbols since what passed as a word in one culture could be seen as another word or even a phrase in another. One of the first trials combining symbols from different cultures had him scrambling for cover as, for the lack of a better description, space seemed to collapse upon itself around the pebble he tried out and imploded with explosive results. Harry was lucky that when it did, the ground beneath it crumbled and dropped his failure into the stream, reducing the effects and the sounds.
He did however create some samples using the stronger pebbles and the few pieces of metal small enough to keep inside his bag with enough surface for him to etch the symbols on. It was certainly quite interesting to see how he could create chains of light to restrict an object, a 'growth accelerator' that could stimulate the growth of a plant safely, or even an amulet that helps to regulate heat around a certain area, the latter being very helpful on the cold nights at the camp. Harry had to work hard in suppressing a grin at people wondering why him and his bunk-mates had such a warm and soothing cabin as opposed to their chilling cabins.
Before long, it was the end of the summer camp and Harry would return to Privet Drive with two new notebooks filled with ideas of pictorial languages, several books and tools loaned by the camp instructors wanting him to practice, and a few prototypes to try out. One of which would prove crucial and most useful when he returned to find the cracked dome of sickly colours back in place, looking a lot bigger and feeling a lot more disgusting to him. One of the stones he had experimented on had the symbols for 'protection', 'barrier', 'power', 'detection', and most importantly to him, 'rejection against ill intent'. He wanted to test the idea of creating a protective field of sorts so that he won't be attacked at a certain area.
It was by sheer coincidence that when he was experimenting with it, he accidentally cut his finger and dripped a few droplets of blood on it, with the stone seemingly absorbing the blood into itself and the symbols glowing briefly. When he approached the barrier, the stone had activated inside his bag and destroyed the dome with a loud crash that sent every car alarm blaring. Then to his eyes, Harry saw four bolts of light shooting out of his bag and towards different directions, then a new dome of pure light and pulsing with new energy sprung up with a force that sent shivers down Harry's spine but was more welcoming to him and seemingly driving away the dregs of the old field away for good. Feeling encouraged, Harry walked through the barrier and had to restrain himself from shaking at the warm and comforting wave that wrapped around him protectively, with the added feeling of chains being removed from his body and making him feel a lot more energetic, certainly a big improvement from the other dome set up by his supposed jailers. If he had to guess, this was his own magic creating the dome, his own 'Force Field' if he dared to say so.
Although an oddity did happen when this was going on. His signature scar started hurting badly and oozed out black blood without warning. He was lucky that he was at an empty street when the scar seemed to split wide open and a horrifying scream of pain rang out, chilling him to the bones from both the sound and from the black cloud that came out of the scar. It could have been from the disorientation but Harry would swear that there was an actual face in the cloud as it twisted in a sickly manner. After a few painful seconds, the cloud dispersed, taking with it the awful looking face and leaving Harry a touch paranoid. It was only the next day did Harry realize that the scar had disappeared almost completely and he was experiencing an upsurge of his magic, as though there had been some limiter on his body that was now removed and he was gaining full access of his abilities. Even his eyesight seemed to have gotten better within the week to the point that he did not require glasses for the majority of the time.
It would seem that making that barrier prototype was the greatest idea he had to that point in time.
He would later get a further demonstration of the barrier when he was visiting one of his teachers for the day. He was just about to reach the door when a sensation of danger blared in his mind while the barrier glowed brightly, before he heard pained yelps and crashing. Harry turned to find two individuals dressed in those weird robes with their hands broken along with those wood type wands, and a third on the ground unconscious. After a quick look-around and feeling with his senses, Harry aimed and focused hard at the two invaders, before firing off a beam of light that struck them both to render them like their third companion. With that taken care, Harry raced for his teacher's house to get to safety, but not before summoning whatever they had on them that could help him identify who they were. The teacher called the police who Harry handed most of the items he got off the oddly-dressed people. The last he heard of them, the police arrested them for disturbing the peace and resisting arrest.