DMadLord

MOUNTAIN SITTING IMMORTAL (MSI)
A conduit of the great Dao happened to enter the grotto heaven called Earth. No one had been able to take ownership of this conduit for many years until Marvin came into contact with it. 
Marvin met the requirement to use the conduit. This allowed him to begin his journey towards immortality. 
The journey begins from transcending the first mortal coil at Body Forging to transcending the second at Energy Gathering, passing through the subsequent mortal coils, and hopefully to becoming a true immortal with eternal life.
But the conduit is far more useful than helping a dying business tycoon gain another lease at life. It is also a conduit of great power. 
This power and many more will be his as long as he continues to sit on his mountain and grows the mountain into a colossus. The mountain will bring him to greater heights and greater power. 
This is the story of the Mountain Sitting Immortal.

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Mountain Sitting Immortal

In his situation, he killed Irvin's friend and will kill Irvin because his dog died and he was nearly killed.

His reaction is completely normal, so it is just right to expect that Irvin wouldn't be lenient with him after he killed Irvin's friends and also came after Irvin himself.

Besides, Irvin has killed people for less transgressions. He has killed someone for looking at his woman in a lustful way.

So there was no way he would have let Arthur go if Arthur had proven to be weak. But he didn't call Irvin out on his lie.

He liked to see Irvin lie in order to survive. It made him chuckle.

Then he asked, "Who asked you to kill the Arthur boy?"

Irvin was stunned. He asked, "Didn't I already answer that…"

Arthur interrupted him with a kick to his stomach and said, "I ask, you answer. Not the other way around."

Then he replied, "I was asked by the R brothers of the society of thieves to kill him."

Mental Torture.