Lucy Heartfilia is the strongest Celestial Spirit Magic user in Fairy Tail with access to ten Golden Zodiac keys. Cancer, despite being a Golden Zodiac Spirit, is one of Lucy's weakest summons ...

Lucy Heartfilia began at the Fairy Tail guild ... Lucy began to develop strong relationships towards her celestial Spirits. This passion and wisdom culminated into her actions in Tartaros.

The end of chapter 167 shows Lucy Heartfilia getting eaten by a giant ... It was there Merc managed to nab Lucy and throw the celestial mage into his mouth. If we know Fairy Tail, being swallowed ...