
Just echoing Tyonis's post: some groups do choose to run a story arc that steps outside the realm of lore currently offered by the game itself. While outside groups can't necessarily say "NO! THIS IS WRONG D:!" if you choose to make your plot public, they can choose to ignore your story arc. Another, kinder way to remove one's self from an awkward lore-clash rp situation is simply to have your character think that they person telling them about lore breaking happenings is a nut-job. Crazier than a sack of coeurls. Flipped like a flap-jack.
I say all this, but don't be afraid to create something new if it's reasonable. There's a fi-i-i-i-ine line between inventive and crazy. For example: my character was once given a crystal that makes different noises when you hold it, based in the emotions you're feeling. Is it lore breaking? Probably. Does it actually effect game cannon in any way? Not really and it does make for amusing shenanigans.
Ultimately if you're with a group that is not ok with lore-breaking and you are, or vice-versa, maybe you need to find another group : P.
I say all this, but don't be afraid to create something new if it's reasonable. There's a fi-i-i-i-ine line between inventive and crazy. For example: my character was once given a crystal that makes different noises when you hold it, based in the emotions you're feeling. Is it lore breaking? Probably. Does it actually effect game cannon in any way? Not really and it does make for amusing shenanigans.
Ultimately if you're with a group that is not ok with lore-breaking and you are, or vice-versa, maybe you need to find another group : P.