Wand core

The core of a wand is needed to perform magic.the known cores are:Phoenix tail feathers,unicorn tail hairs,dragod heartstrings and veela hair.The Elder Wand has a core of thestral tail hair,but it is the only wand to have such core.Sometimes wands have brothers.These wands have the same core from the same source.For exanple,Harry's and Voldemort's wands have phoenix feathers from Fawkes,Dumbledore's phoenix.However,two wands with phoenix feathers from two phoenixes,for exanple,are not brother wands.