'D, you did not complete the explanation.'
[Oh yeah.
Sword Will is the ultimate weapon against high-level adventurers because none had ever stopped it.]
'Let me guess. The corrosive potential of Qi on adventurers!'
[Yes, but partially.]
'Partially?'
[The role of Qi in killing an adventurer is undeniable. But the absence of high-level Mastery adventurers is attributed to the Star Polygon phenomenon.]
Lee couldn't help but gasp inwardly at this revelation. He had thought of multiple ways an adventurer could be killed but never did he expect the event which acts as a levelling arena is an indirect beacon for homing in enemy projectiles.
[The Star Polygon not only spews vague details of the adventurer but also his position. For someone who is a half-step to the God Class, sending his/her weapon halfway across the planet may be very difficult but not impossible.