When Eva reached the palace of Bove Derg alone, greatly was he troubled lest evil had befallen the children of Lir.
But the attendants, because of their great fear of Eva, dared not to tell the King of the magic spell she had wrought by the way. Therefore Bove Derg asked, 'Wherefore, O Eva, come not Finola and her brothers to the palace this day?'
And Eva answered, 'Because, O King, Lir no longer trusteth thee, therefore would he not let the children come hither.'
But Bove Derg believed not his foster-daughter, and that night he secretly sent messengers across the hills to the dwelling of Lir.
When the messengers came there, and told their errand, great was the grief of the father. And in the morning with a heavy heart he summoned a company of the Dedannans, and together they set out for the palace of Bove Derg.
And it was not until sunset as they reached the lone shore of Lake Darvra, that they slackened speed.
Lir alighted from his chariot and stood spellbound. What was that plaintive sound? The Gaelic words, his dear daughter's voice more enchanting even than of old, and yet, before and around, only the lone blue lake. The haunting music rang clearer, and as the last words died away, four snow-white swans glided from behind the sedges, and with a wild flap of wings flew toward the eastern shore. There, stricken with wonder, stood Lir.
'Know, O Lir,' said Finola, 'that we are thy children, changed by the wicked magic of our step-mother into four white swans.' When Lir and the Dedannan people heard these words, they wept aloud.
Still spake the swan-maiden. 'Three hundred years must we float on this lone lake, three hundred years shall we be storm-tossed on the waters between Erin and Alba, and three hundred years on the wild Western Sea.
Not until Decca be the Queen of Largnen, not until the good Saint come to Erin and the chime of the Christ-bell be heard in the land, not until then shall we be saved from our doom.'
Then great cries of sorrow went up from the Dedannans, and again Lir sobbed aloud. But at the last silence fell upon his grief, and Finola told how she and her brothers would keep for ever their own sweet Gaelic speech, how they would sing songs so haunting that their music would bring peace to the souls of all who heard. She told, too, how, beneath their snowy plumage, the human hearts of Finola, Aed, Fiacra, and Conn should still beat the hearts of the children of Lir. 'Stay with us to-night by the lone lake,' she ended, 'and our music will steal to you across its moonlit waters and lull you into peaceful slumber. Stay, stay with us.'
And Lir and his people stayed on the shore that night and until the morning glimmered. Then, with the dim dawn, silence stole over the lake.
Speedily did Lir rise, and in haste did he bid farewell to his children, that he might seek Eva and see her tremble before him.
Swiftly did he drive and straight, until he came to the palace of Bove Derg, and there by the waters of the Great Lake did Bove Derg meet him.
'Oh, Lir, wherefore have thy children come not hither?' And Eva stood by the King.
Stern and sad rang the answer of Lir. 'Alas! Eva, your foster-child, hath by her wicked magic changed them into four snow-white swans. On the blue waters of Lake Darvra dwell Finola, Aed, Fiacra, and Conn, and thence come I that I may avenge their doom.'
A silence as the silence of death fell upon the three, and all was still save that Eva trembled greatly. But ere long Bove Derg spake. Fierce and angry did he look, as, high above his foster-daughter, he held his magic wand. Awful was his voice as he pronounced her doom. 'Wretched woman, henceforth shalt thou no longer darken this fair earth, but as a demon of the air shalt thou dwell in misery till the end of time.' And of a sudden from out her shoulders grew black, shadowy wings, and, with a piercing scream, she swirled upward, until the awe-stricken Dedannans saw nought save a black speck vanish among the lowering clouds. And as a demon of the air do Eva's black wings swirl her through space to this day.
But great and good was Bove Derg. He laid aside his magic wand and so spake: 'Let us, my people, leave the Great Lake, and let us pitch our tents on the shores of Lake Darvra. Exceeding dear unto us are the children of Lir, and I, Bove Derg, and Lir, their father, have vowed henceforth to make our home for ever by the lone waters where they dwell.'
And when it was told throughout the Green Island of Erin of the fate of the children of Lir and of the vow that Bove Derg had vowed, from north, south, east, and west did the Dedannans flock to the lake, until a mighty host dwelt by its shores.
And by day Finola and her brothers knew not loneliness, for in the sweet Gaelic speech they told of their joys and fears; and by night the mighty Dedannans knew no sorrowful memories, for by haunting songs were they lulled to sleep, and the music brought peace to their souls.
Slowly did the years go by, and upon the shoulders of Bove Derg and Lir fell the long white hair. Fearful grew the four swans, for the time was not far off, when they must wing their flight north to the wild sea of Moyle.
And when at length the sad day dawned, Finola told her brothers how their three hundred happy years on Lake Darvra were at an end, and how they must now leave the peace of its lone waters for evermore.
Then, slowly and sadly, did the four swans glide to the margin of the lake. Never had the snowy whiteness of their plumage so dazzled the beholders, never had music so sweet and sorrowful floated to Lake Darvra's sunlit shores. As the swans reached the water's edge, silent were the three brothers, and alone Finola chanted a farewell song.
With bowed white heads did the Dedannan host listen to Finola's chant, and when the music ceased and only sobs broke the stillness, the four swans spread their wings, and, soaring high, paused but for one short moment to gaze on the kneeling forms of Lir and Bove Derg. Then, stretching their graceful necks toward the north, they winged their flight to the waters of the stormy sea that separates the blue Alba from the Green Island of Erin.
And when it was known throughout the Green Isle that the four white swans had flown, so great was the sorrow of the people that they made a law that no swan should be killed in Erin from that day forth.