Wand Core: Doxy Wings (Canon)
Rather rare in today's world, doxy wing wands can be unmanageable in inexperienced hands. They are, however, quite gifted in dark magic, and can be found in the hands of individuals who fancy themselves dark wixes, but haven’t the connections to get the much better (yet exceptionally rare) Basilisk skin wands.
Doxy wing wands are decent all around, and above average when casting the most nasty of jinxes and hexes. They have a natural bent towards dark magic and can be surprisingly lethal in the hands of a sufficiently evil wix.
These wands exult in cruelty and may vibrate or hum when being used for especially dark spells, there are stories of them letting out a high-pitched maniacal laugh during such sadistic spells as the cruciatus curse.
Doxy wands do not pair well with wood of a lighter or upstanding nature, performing very poorly or not at all in such matches. Dogwood, with it’s good natured and loyal disposition is an especially poor wood for this core, the combination cracking the wood and destroying the wand beyond repair.
Doxy wing wands are very temperamental and mean-spirited, requiring an owner with either a very steady hand or a similarly nasty temperament. Cruel and sadistic wixes though they are, these individuals are usually rather cowardly, and will likely run from a real fight. (It’s kinda pathetic, really.) It is quite unheard of for a good wix to have a wand with this core.
“Though I usually insist there are no truly evil wands, only evil owners, Doxy wings are one of a few cores with which I make an exception. Even in the most noble hands, these wands will be cruel, malicious and dark... I knew someone with a doxy wing wand once. F@ck that guy.” - January Hawkins, Resident Wandmaker, Ilvermorny School of Witchcraft and Wizardry.
(Image from Harry Potter wikia)