Banished to the deepest corners of Hallownest due to being deemed a major threat, not knowing they put his children in danger.

some lore about goliath: he kept to himself in the waterways
he was afraid of the bugs above, he thought they would harm his tadpoles
when the bugs found his tadpoles while in the waterways, they took them away for the soul sanctum to study them
this obviously made goliath furious
he attacked the bugs above in an attempt to save his children, but they pushed him back into the waterways
the pale king caught site of goliath, and sent the amphibian to what would become the ancient basin
after the infection broke loose, the tadpoles managed to escape the sanctum, but were taken by another, more sinister force afterwards
goliath slowly lost his sanity due to both the infection and the loss of his tadpoles, until the knight shows up, knocks some sense back into him and regains control of his body

Frog