"I have to decline. I care a lot about my weapon."
One decided not to participate because he doesn't want to lose his weapon. If they fail and die, then they will lose their weapon because it will not follow them when they die. These artifacts are very valuable and this person doesn't want to lose theirs.
The female battle sage monkey tried to convince him. "There's nothing to fear since we won't fail."
But the person was not convinced. He said, "You must be foolish if you think there's nothing to fear in attacking the child of the plane. You must be very foolish indeed."
Soverick is not an ordinary person. He is a genius and worse than that, he is the child of the plane. What they have seen of him is just his personal strength. He hasn't used the abilities of his title to fight yet but what they have seen is already enough to put fear in a sane person. To say that there is nothing to fear is to be insane. It is common sense to be very afraid of him.