Sketch of a prosthetic arm made specifically for Coronis. Though the design could fit others too. It is crafted to have the appearance of armor so it looks natural when she is in full gear. This one is adamantine, but not crafted in a way that causes weakness in sunlight because Coronis mostly resides on the surface now.
The arm is sturdy and versatile, in some regards, an upgrade to a natural flesh arm. It is custom made and features extra enchantments that benefit the user. The more enchantments, the higher the cost. You could also choose to add extra engravings for aesthetic purposes or things like oath tenets, phrases, etc etc. a drow noble may also engrave their house glyph into the prosthetic. Pretty much any limb could be crafted using the same technique. Arms, hands, fingers, legs, etc.
In Coronis’ case, this is her left arm. She is ambidextrous and can switch between arms with ease, but gravitates towards her right. So, in battle she uses her adamantine arm to normally perform sword techniques that require both arms, as well as using it to block incoming attacks. The arm is strong enough to withstand pretty much all weapon attacks (unless enchanted in a specific way) the arm doesn’t add to her armor class or anything but can serve as a form of protection with some finesse.
(This is homebrew and may not be accurate to canon dnd lore)
