Olag was one of the few members of his tribe allowed to hunt freely. The others were held and used as slaves by the Ronans, when they began to drill towards the Earth's core.
Olag had stolen one of the Ronans' laser-like weapons ("Thundersticks") which was ultimately used to weaken the caves beneath the Dead Sea. This led to flooding that trapped the Ronans below ground with sea water that they were allergic to. (PROSE: The Heat-Seekers)