Six of the witchiest YA covens

At the BN Teen blog Nicole Hill tagged six of her favorite covens in YA fiction, including:
The Midnight Witch, by Paula Brackston

When Lady Lilith Montgomery’s father dies, he leaves her something to remember him by: the title of Head Witch of the Lazarus Coven. Naturally, that new job comes with hefty responsibility and inherent danger. Lilith will lead the coven in its charge to guard the