I discovered today that my DM (D & D 5e) had made some modifications to the background of my character, especially some of the constituent parts of his "creation". These changes are on the borderline of myth and logic, which would not be a problem unless it has landed more on the myth side, which has placed the soul in a position "adjacent to death". My character is a twin soul, a pair of twin babies who have been seriously injured and, before dying, the traveler stepped in and bound them into one being.
To quote my DM:
Yes but I have a system where, like [character] the levels of the manifestations of his soul become more powerful and he acquires new abilities. Level 3: Beyond the Valley: Your eyes turn milky white and you can see through the eyes of your second soul (Ethereal Vision 10ft) 1 / short or long rest. 6th Level: Ghostly Presence: You can activate this ability to turn your body into a ghost (Fair Appearance) and if in battle any creature that can see you must make a save roll equal to 8 + skill bonus + charisma modifier. You should be dead, the traveler is powerful but not powerful enough to eliminate all the factors of a dead soul, the queen of crows would never allow it.
The problem is that in my original story, the character was not really dead. Near death, but not dead. Saved from death by the traveler. Its changes place this event in the kingdom of the crows queen and lead to the problem of "adjacent death".
As a result, I now have some problems. First of all, she started by telling me about two custom exploits, which do not make sense, either mechanically or for the character.
Second, with these changes, the reason for being the story of the character does not make sense. It's already a crazy character, but with these changes, it's really bad and I can not play that. I predict that it will be unplayable at level 6.
Playing in character This is a bit of a goal for me, and some characters are simply unrealistic, even for D & D. A crazy teenager who likes to stab objects, eat his lunch in random sewers and goes everywhere, is pretty crazy. There is no need for me to add all this semi-ethereal mess, adjacent to death and half ghost.
I do not know if she will add the exploit or force me to replace it with a feat I would have taken. In any case, it adds nonsense to a character. She seems to think that it's a really cool thing, so if I let that happen and ignore her, she'll be more insulted in the long run. So, I have to smother this in the bud, but as cleanly and gently as possible.
So, explanation given, my question is: how can I tell him this without insulting him?