It is according to King Piccolo in Dragonball!
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Chapter 12: Madness
Queck looked at the nest. “Are those… Dark Wing eggs?” Flek nodded. Queck looked at Rook, “Why did he bring them here?” Flek shook his head, “He didn’t bring them. He… made them himself. I’ll explain later.” Karbo moved towards the nest. Rook was staring at him, tears still in his eyes. “Wh-What are you doing?” Karbo tried to pick up one of the eggs, Rook moved closer to them. “No! Don’t touch my children.” Karbo took a few steps back. Alon sighed, “This is the manifestation of the Dark Gift.” Queck turned to face Alon, “a Dark Gift?”
Alon turned to look at Queck, before looking towards Rook. “The Dark Gift is what a Slig receives when they are bitten on the neck by a Dark Wing. The benefits may include heightened senses, better night vision, extra strength, faster speed….” Queck interrupted, “Then why are we so worried?” Flek let out a small growl and spoke, “There are negative aspects to this gift as well. To start with, there is only a fifty percent chance that the transformation will be beneficial. Otherwise, the subject undergoes a slow and painful process which results in them becoming a Dark Wing themselves.”
Alon looked at Flek, “That was the worst case scenario. Rook seems to have avoided that fate at least.” He glanced back at Rook before continuing, “This type of transformation occurs when the victim does not have enough time to inject the anti-venom into the bite wound. Rook was lucky enough not to die from the venom.”
Karbo turned to face Rook and whispered, “So, shall we take the eggs from him now?”