Managed to find it in cleartext (https://talesofmytery.blogspot.com/2014/03/lester-del-rey-evensong.html):
EVENSONG
by Lester del Rey
By the time he reached the surface of the little planet, even the dregs of his power were drained. Now he rested, drawing reluctant strength from the yellow sun that shone on the greensward around him. His senses were dim with an ultimate fatigue, but the fear he had learned from the Usurpers drove them outward, seeking a further hint of sanctuary.
It was a peaceful world, he realized, and the fear thickened in him at the discovery. In his younger days, he had cherished a multitude of worlds where the game of life's ebb and flow could be played to the hilt. But the Usurpers could brook no rivals to their own outreaching lust. The very peace and order here meant that this world had once been theirs.
He tested for them gingerly while the merest whisper of strength poured into him. None were here now. He could have sensed the pressure of their close presence at once, and there was no trace of that. The even grassland swept in rolling meadows and swales to the distant hills. There were marble structures in the distance, sparkling whitely in the late sunlight, but they were empty, their unknown purpose altered to no more than decoration now upon this abandoned planet. His attention swept back, across a stream to the other side of the wide valley.
There he found the garden. Within low walls, its miles of expanse were a tree- crowded and apparently untended preserve. He could sense the stirring of larger animal life among the branches and along the winding paths. The brawling vigor of all proper life was missing, but its abundance might be enough to mask his own vestige of living force from more than careful search.
It was at least a better refuge than this open greensward and he longed toward it, but the danger of betraying motion held him still where he was. He had thought his previous escape to be assured, but he was learning that even he could err. Now he waited while he tested once more for evidence of Usurper trap.
He had mastered patience in the confinement the Usurpers had designed at the center of the galaxy. He had gathered his power furtively while he designed escape around their reluctance to make final disposition. Then he had burst outward in a drive that should have thrust him far beyond the limits of their hold on the universe. And he had found failure before he could span even the distance to the end of this spiral arm of one galactic fastness.
Their webs of detection were everywhere, seemingly. Their great power-robbing lines made a net too fine to pass. Stars and worlds were linked, until only a series of miracles had carried him this far. And now the waste of power for such miracles was no longer within his reach. Since their near failure in entrapping and sequestering him, they had learned too much.
Now he searched delicately, afraid to trip some alarm, but more afraid to miss its existence. From space, this world had offered the only hope in its seeming freedom from their webs. But only micro-seconds had been available to him for his testing then.
At last he drew his perceptions back. He could find no slightest evidence of their lures and detectors here. He had begun to suspect that even his best efforts might not be enough now, but he could do no more. Slowly at first, and then in a sudden rush, he hurled himself into the maze of the garden.
Nothing struck from the skies. Nothing leaped upwards from the planet core to halt him. There was no interruption in the rustling of the leaves and the chirping bird songs. The animal sounds went on unhindered. Nothing seemed aware of his presence in the garden. Once that would have been unthinkable in itself, but now he drew comfort from it. He must be only a shadow self now, unknown and unknowable in his passing.
Something came down the path where he rested, pattering along on hoofs that touched lightly on the spoilage of fallen leaves. Something else leaped quickly through the light underbrush beside the path.
