Slug had heard of the fruit of the Tree of Might before.
It was a fruit of life formed by absorbing a planet's essence. Eating it allowed one to absorb the life essence of an entire planet, not only extending one's lifespan but also greatly increasing one's strength.
Although Slug no longer sought a longer life, he still craved greater strength.
After all, Slug had never forgotten the humiliation the Frieza Race had inflicted on him when his strength declined in his old age.
In his youth, Slug had once had few rivals in the North Galaxy, earning renown throughout the universe as a vicious emperor.
But after encountering the Frieza Race, Slug had suffered a crushing defeat.
The Frieza Race's strength rivaled even that of Super Namekians. More importantly, they possessed exceptionally long lifespans.
Hundreds of years later, when Slug had grown old and his battle power had declined, his former opponent, King Cold, was still in his prime and had fathered two children whose strength was no less formidable.
In the end, the Frieza Race had swallowed up all the territory Slug had conquered over years of war. At one point, he had even been forced to hole up on Planet Slug, where his rise to power had begun.
It was the greatest humiliation of Slug's life.
Now that he had recovered his strength, Slug naturally intended to take revenge on the Frieza Race.
However, he had heard that Frieza, the prodigy of the Frieza Race, had actually been killed by a Saiyan.
Upon hearing this news, Slug suddenly realized that there was always someone stronger out there.
Although he was confident that he, too, could now deal with Frieza, Slug ultimately decided to find the fruit of the Tree of Might and increase his strength first.