Fairy Tail Episode 305

Mavis and Zeref stare each other down, having met again after nearly a century. Mavis remembers her plan to defeat him, and ponders how she must carry it out, only to be unexpectedly frozen solid by Invel out of fear of her Fairy Heart power.

Zeref orders Invel to free Mavis, reminding him she cannot use Fairy Heart against them anyways and from pity as she was already trapped inside a crystal for an eternity. Invel reluctantly obliges.