Its only my guess, but I think that usually people would not bother creating spells, and they probably have to be ministry approved. dont think it is totally illegal though, because snape probably would have not written them in his textbook if it was. as to creating spells, I guess he would use existing spells and mix them together, Like in COS, Harry uses the tickling spell "rictumsempra" which sounds very simelar to "sectumsempra" only one tickles and the other cuts into the person.

Well, spell invention is quite simple. You must find the goal you are trying to accomplish with your wand, then, you must come up with the incantation. The spells in the HP books are Latin. So for instance-- 'Sectumsempra'--Cut Forever.
Then, you must charge your spell. Focus all your magical energy into it....and it should work.

Really! oh wow, Severus is a genius though I doubt many wizards and witches could create spells like Severus did, and he did it when he was really young too!

Go Severus!

I think you mix up alot of spells, Like You can mix A cutting Charm with Impediment Spell(or whatever it is). Thats how u might make a spell.

If it has something to do with ethier wand movement and/or incantation a first year could accidentaly create a spell while trying to do another, like Lockhart who ended up making (or accidentaly copying a spell) that made Harry's arm bones dissapear,


Imagine doing that in battle or firing that spell down the mouth of a basilisk (Do basilisks have bones?) fighting is made so much easier.


Thats probebly the easiest way to make a spell by altering,


Wand Movement,Incantation,Intent.


Afterall if you got the grasp of a spell (eg. Wingardiem Leviosa) you no longer need incantation,or can do it wandlessly therefore abandoning wand movement you rely of POWER and INTENT alone,


I belive INTENT is the key to magic in th PotterVerse.

I don't rlly have a idea of how you create a spell, but i think i t would have to be ministery approved or somehting like that

yeah that sounds good!
i remember some wizards not even like moving and a spell happens.
so yeah i kinda see now.
but thats cool! like i guess you could do whatever you want?