Cait Sith (Final Fantasy XIV)

Cait Sith is a non-playable character from Final Fantasy XIV: Heavensward First introduced in version 3.1 As Goes Light, So Goes Darkness, Cait Sith is a familiar of a Mhachi voidmage watching over the Void Ark.

Story
Cait Sith is seen at the end of the Void Ark raid dungeon, where he warns the Warrior of Light and the sky pirates to flee while Diabolos seized the Queen's Coffin. After the latter retreats into a voidgate, Cait Sith tells his story to the sky pirates. His master, High Voidmage Cessair, had foreseen the flood of Sixth Umbral Calamity due to disruption on the land's aether caused by Mhach's destructive campaign against Nym and Amdapor in the War of the Magi.

The Void Ark was created to ride out the coming deluge, with thousands of Voidsent drained to power the vessel. At its core was entombed Scathach, the Shadow Queen. Contain such a powerful voidsent required a sorcer of immense skill, but even Cessair herself could not keep the queen sealed away. Eventually, Cessair and 53 other void mages had to sacrifice themselves to keep Scathach and the other voidsent sealed away.

The Void Ark drifted in the Sea of Clouds for centuries under watch of Cait Sith. Unbeknownst to the Warrior of Light and the Seedseers, when the former confronted the awakened Diabolos in the Lost City of Amdapor, the voidsent managed to escape in the form of a bat and flew into the Void Ark. Though initially held at bay by Cait Sith, being on board the ark allowed Diabolos to become much stronger, able to awaken all the sealed voidsent on-board the vessel. While most had been eliminated by the adventurers hired by sky pirates, Diabolos managed to retrieve the Queen's Coffin to parts unknown.

Cait Sith implores the sky pirates help him track down the rogue voidsent and the missing coffin, before the Shadow Queen is unleashed on the realm.