Dark Summoner: Kill the Summons First at the Beginning

Blue Star has merged with many other worlds, countless monsters have descended, and all humans are in danger. The world has entered the end of the world, and everyone's status has become low-level. Human beings can only struggle desperately to survive. Li Xiuran became a summoner, but got the talent of gaining some attributes when the summoned object dies. After each summoned object dies, his enemy will face the summoner himself who is more powerful than all the summoned objects put together.