What is the use of upgrading the pupil of the abyss?

This prop, the soul of the crystal, the pupil of the abyss, is used to trace the apocalypse.

The eye of the abyss traces the essence of the apocalypse with the crystal soul of the eye of the abyss, and then exchanges the essence of the apocalypse for the heart of the sky. On the contrary, the heart of the sky can be traced back to the soul of the apocalypse with the heart of the sky, which can change the pupil of the abyss. After upgrading the V form, the ejection range becomes larger and the ejection frequency increases. The talented player of Abyss Pupil can directly kill. One * * * two energy bars, all of which are injuries, and the following is death. You can't die without a full set. Without a full set of v, it is the form of upgrading the main weapon. The previous two pieces were fine, but now you must have four pieces.

The "V" key of the pupil of the anti-war abyss is a skill key, and the specific information is as follows: the pupil of the anti-war apocalypse abyss is a sniper rifle, and his V-building is to summon death, then attack with all one's strength will kill the monster, and then right-click to summon the soul lamp, which is a range damage and will kill the monster who stepped into the soul lamp.