Amulet of the Long Lost

This Golden Amulet Stylized like a turtle shell is a sentient lawful good magic item that can telepathically communicate with the attuned character, If dropped in sufficiently large body of water the attuned character can speak its command word to have it grow into The Long Lost while in ship form you can over 1d4 hours convert it back into an amulet at which point it teleports around your neck