He was looking for a weapon when he stumbled upon a loot box. He didn't even consider the result of his actions because he didn't sense any danger. He broke the loot box and found a very strong blade. Some people saw him get the weapon and they attacked him. He could have avoided them if only he had been careful and observant of his surroundings. He could have hidden and waited for them to pass by before breaking the loot box but he didn't because he didn't sense any danger.
He was wrong about that. His new instinct for danger gave him false confidence. The box wasn't dangerous but the 10 or so people that attacked him are very dangerous. He fought them but they were too many for him. So he ran away from them and they gave chase. He was able to escape due to his superior speed and he found a place to hide in the city of stone that they are in.
He is hiding on the 3rd floor of a building. The city is filled with such buildings of stone. It is a jungle of structures made out of stone. The stones aren't precious or enchanted. They are ordinary stones created from a hardened mixture. The city is abandoned and derelict so there's no one occupying the buildings. He was able to lose his pursuers within the maze of buildings and hide in one of the buildings.
The room he is in is empty and dusty but it granted him a good view of the ones chasing him now fighting for their lives. The ones that tried to take his weapon were ambushed as they were looking around for him by another group. The two groups make a total of 20 fighters. Their numbers are dwindling fast because of the generous use of explosives. Ghaster is watching and waiting. He is waiting for them to injure themselves well enough for him to finish them off.
He believes it will happen. The world has been moving to his whims ever since he beat Amegle. It is like he became lucky or he suddenly became talented at doing things. He gained a sort of intuition for making the right decision. And right now, his intuition is telling him to wait for the opportunity to appear. He can choose to escape but he chose to wait because his intuition has not been wrong so far.
His wait bore fruit. The opportunity arrived after their number was reduced to 6 with 4 on the winning side and 2 on the losing side. The group that chased him to kill him are the ones losing. They were ambushed by a group with a larger number so it is expected. They fought well though. They should have been annihilated but they managed to cut down a lot of their enemies before their defeat. Now they are being cornered by enemies that ambushed them just like they tried to corner him. The world itself is punishing them for trying to hurt him.
His lips curled into a feral grin at the opportunity that has been delivered to him by fate. His pursuers are to be his prey.
He said to himself with anticipation, "It's my turn now."
Then he turned into a bolt of blue lightning. He flew from the building he was in, circled around the back, and approached from behind the winners. He appeared behind the unsuspecting 4 with his weapon raised high. Both of his hands gripped his blade tightly. The other 2 saw him and their eyes widened in panic. They have seen something like this before. It decimated some of their group earlier before they were ambushed. So they are very afraid of what's going to happen next.
Their weird behavior alerted the 4 that are cornering them. One of them looked behind just in time to see Ghaster bring down the blade. There was a flash of light as lightning fell from the sky on the 4. A torrent of blue lightning poured down in a great pillar onto his enemies.
"BOOM."
There was a massive explosion that rocked the earth. The violent energy of the lightning entered their bodies and wrought untold destruction. Their bodies dried up and cracked. Then the thunderclap of the lightning shattered their bodies to dust. They disappeared before their bodies broke apart leaving him with the other two.
The other two were slammed by the residual force of the thunderclap. They were thrown against the wall behind them and almost knocked unconscious. They struggled to stand up but they did nothing after that. They have nowhere to go and their backs are literally against the wall. Their eyes were glued to the figure obscured by smoke and dust. They can see his sparkling eyes and they can hear his lightning-frazzled hair sizzling and popping. If they are to escape then they must go through him.
The dust finally cleared to reveal his figure. He was still grinning at them.
"Remember me?" He asked them.
They remember him. He was the one they were chasing before. But now, there is a massive smoking crater between them. It is a crater that he created. The bodies of those who were there earlier are nowhere to be seen. The same thing could have happened to them. The only reason why they are alive is because he soared them. But that has not alleviated their fears. So their refusal to speak is understandable.
They know that they are probably going to die so they don't have any interest in humoring their killer. The two parties just stared at each other. One side outnumbers the other but it is the outnumbered party that is confident of victory. The crater of melted and scorched stone ground beneath them can attest to how destructive lightning can be. They are live because of his mercy. But he didn't spare them without hoping to get paid. They have much to pay for.