"Then Dailir he drew, his dart beloved; howso far fared it, or fell unnoted, unsought he found it with sound feathers and barbs unbroken (till it broke at last)"
[...]
"There the huntsman's hand was hurt deeply, as he groped on the ground, by a gleaming point - 'twas Dailir his dart dearly prized he had found by his foot in fragments twain, and with barbs bended: it broke at last neath his body falling. It boded ill."
Christopher Tolkien comenta sobre essa parte do poema:
There is also in the poem the feature of the arrow Dailir, unfailingly found and always unharmed, until it broke when Beleg fell upon it while carrying Turin: of this there is never a mention later.
Então, parece que esta flecha mágica foi uma invenção passageira que não foi dada nenhuma explicação ou história adicional.