The witch's elf [will be republished as Now you need me]

Daughter of Wrath, Child of Cercei, the most powerful until she got betrayed by her lover causing her to grow in madness and destroy half of the world.

She was locked up to be forgotten but how come she was suddenly reawoken by the people she hates to fulfill a quest. As if that was not bad enough, she accidentally got bonded to a weak little elf who's only talent is acting cute