[quote=SomeoneSomewere]
1. His history discusses that. He was sent to observe and he is not happy about it.2. I'm mostly planning on removing the power effect that it has on mortals, removing its ability to set mortals on fire with one hit. Because that's insane. I think it will function more as a special sword that is used to kill demons and such, with the angelic fire included. Because, come on, that's awesome. An idea, if it becomes too much, is that the headmaster confiscated it from him, only returning it when it is needed for a specific class or just providing him with a sword of very similar aspect just not all angel like. That way, if he gets mad at some demon he won't just try to kill him with it.3. Really, the most I've found have been healing, sight, one "invisibility" but it really doesn't do too much. is the full list of them, but I definitely won't be using them all. Just not gonna happen, there are too many, and like I've mentioned, he doesn't know them all. So even then, the insanely powerful ones he might not know. There is no definite time that I've seen, and the strength of them depends on many things. There are very few( only one that he has) that lasts forever. Some, last for a few minutes. It depends how hard you"draw" the rune effects the time it lasts. For the strength of them, the closer to the heart the stronger. But if it effects like the arms or legs, then it would be placed more on them. Again, there are no stated strength, so you can only go off of what information is given. 4. In the series, the demons would try to disguise itself and make itself look like a normal human. In the series, the demons didn't look human. I guess that doesn't really effect this roleplay. I can remove it, just still keep the first mark you get( it provides the sight, and is the only permanent one he has). Doesn't help in the series all demons are considered bad, evil, and need to be destroyed. He has the same point of view for the most part.Don't be sorry, this is your rp, and if someone popped in with something with all these different stuff, I would be feeling the same way. I actually like it, it's allowing me to work out the things I want different compared to the actual series.
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Hear are my thoughts. 
1) I apologize for not paying too much attention to the history. That was my mistake. 

2) maybe say that the sword becomes engulfed in an angelic fire which causes more damage and effective demons in a negative way. Such as slowing down regenerative powers and weakening their abilities altogether. This seems like a fair compromise so you can't really one hit a demon that is a low level weak NPC. Also rather than confiscation have the head master have magically seal the blade's ability. He gave the key words to seal and unseal it however, the magic seal allows the headmaster to know when it has been turned off and on. So you may only turn it off for a specific class, that being a sort of special P.E. which is for using and training powers and special abilities. Of course, there will be other special occasions. I hope this power for the sword is alright. But you can always tell me how the angel fire is actually supposed to work and we can talk about it ^_^"

3) Just limit and tone down the runes accordingly and I'll allow you some freedom and creativity with them. Just don't go crazy with the powers and how long they last.

4) Like I said I don't mind the sight. And it may even come in handy later. So I don't think you need to get rid of it. But don't randomly attack Yokai. Especially later when we'll need to leave the school.