They were apparently at first only 'wonder-workers,' for the original legends seem to have been few.

Yet the striking similarity in these aspects with the brothers of Helen must offset the fact that so much in connection with them seems to have been added in books one and ten.

They restore the blind and decrepit, impart strength and speed, and give the power and seed of life; even causing waters to flow, fire to burn, and trees to grow.

As such they assist lovers and aid in producing offspring.
The Acvins are brilliantly described, Their bird-drawn chariot and all its appurtenances are of gold; they are swift as thought, agile, young, and beautiful.

Thrice they come to the sacrifice, morning, noon, and eve; at the yoking of their car, the dawn is born.