I have a story arc in my series where some of the characters are humanoid dragons. Not for the purpose of making scalies, it's for other story purposes. I could explain if someone wants me to, but as of right now i just want an answer to this. One of my lizardmen characters has a unique tail that serves purposes in combat. Her tail starts off thin from the base, then extends for a bit before widening to incredible thickness. She can move her tail in all directions, and it has such great muscle power that she can hold a large sword's sheath in its coil with ease. Now, disregarding whether any of this is possible (magic will explain it at a later date), let's get into the meat of the matter. The sheath I mentioned earlier belongs to a long curved sword, about the length of her legs. The sheath itself has a spiral patterned gap in it, which serves as a divet for the tail to rest in as it curves around the sheath. You might be thinking, "but when she sheathes the sword, it's gonna cut her." That's the point of the sheath though, as when the blade draws blood, she can use it as a catalyst to imbue the blade with magic. All characters in this story have regenerative powers, to the extent that moments after drawing blood, her wounds have healed. At least that's the idea. If anyone knows what the ramifications are of constantly cutting scales and/or the healing process of scales, please let me know. Any other thoughts you have on the concept or process I described would be welcome too.