He has accomplished his mission in our world and sets off for the Underworld, so he can return again next summer.
This is why the Kupalo festival (summer solstice) is actually bidding farewell to the old-aged Yarilo - a preparation for his later ritual burial. During the celebrations, for the last time people express their joy of god Yarilo's visit in their world, the happiness he had brought; they sing incantations and prayers to the fertile god to come again next year.
The year is half-way through, last fruitful months are elapsing and then winter will come - the time of death goddess Mora, time of darkness, cold, misery, illness and death.
Books in PDF format to read:
Stephen Flowers - RunaMichael Prescott - Darklore
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