Rigias gets frustrated from all the actions of Arthur. It roared again and facing towards sky it fired a beam. It didn't stopped there, it fired the beams on all directions.
In Arthur's mind there is only one plan and he wanted to try it for which he has to climb upto Rigias's head and use explosion magic on its eyes. It was his last hope.
Climbing upto head is not easy task because he is already exhausted from dashing towards Rigias, using explosions, fire blasts on it. But his determination is forcing him to do that.
He didn't accept defeat and climbed upto his head and the Rigias also not stopped shooting beams of mana.
He climbed upto Rigias's neck. Now the question in his mind his how can he attack its eyes. Because Rigias is not in stable position he is moving his head here and there, destroying forest etc.
Arthur has to make a move, he clearly observed the pattern of Regias heads' movements and understood the trajectory of its head.
He planned that he will again focus all his mana and creates a mana bomb and fires it on his eyes but the question is how can he make the bomb because he is using his arms to hold Rigias. The method he learned is to concentrate mana in his hands and imagine it into a spherical ball like bomb.
The questions in his mind were -
"How can I shoot his eyes?"
"Will this be my last battle?"
"Will I die before achieving anything?"
"No, no I have to calm myself "
"Oooof"
Arthur observed Rigias beams carefully and thought that what if he can also shoot a beam like it. He started to imagine how Rigias is shooting beams. He hanged there with one hand and with other hand he is imagining the mana ball and increasing the concentration. He is imagining a laser gun which shoots laser beams on excitation of electrons.
He is compressing his mana into smaller size so excitation occurs and can shoot a beam. He was imagining more and more and suddenly a beam came out. But the direction of his hand pointing towards Rigias face.
The beam strike on Rigias face. Arthur understood his mistake and "oops" came from his mouth.
Rigias got highly frustrated and facing towards sky it roared using all its might. Arthur thought that it is his chance he jumped from there and started focusing his mana using both hands. The only thought in his mind was to create the mana concentrated beam as quick as possible because he falling from that height. Even if he live with some injuries but Rigias will finish him off. So he has to activate the beam before he reach the ground.
Arthur emptied all the mana from his body and aimed towards the Rigias eyes. The shot has to be perfect because if Rigias tilt its head by a little or his aim was not perfect then his death is confirmed.
But he has god's luck (may be because he is son of a god). It was bullseye. The mana beam directly hit the eyes of the Rigias. The beam was so powerful that it even penetrated from other side of its head.
(It was headshot)
His luck had helped his hardwork. He fell on to the ground but he didn't felt the pain. His happiness of defeating a lake monster is much more.
Rigias fell down just like a non living thing is falling down. Rigias blue blood is flowing like a river from its head.
Arthur covered the brightness of sun which is striking his eyes with hands and then clenched his fists and shouted.
"Yeah, Finally"