Global Weirdness: I Unlocked the Summons of All Realms

(Global weirdness, system flow, invincible start, decisive killing, novel setting, ghost control master) Five years ago, a strange outbreak occurred all over the world. Ghouls recorded in ancient books wander in the sewers, the slit woman in urban legends appears on the streets at midnight, and the laughter of children comes from the corridors of abandoned hospitals... Humanity fell from the top of the food chain and became prey. Governments of various countries rebuilt order on the ruins and finally found a way to combat the strangeness: Sign a contract with a fierce ghost and feed the ghost with flesh and blood in exchange for extraordinary power. … Lin Ze, a traveler from a parallel world, encountered a supernatural event as soon as he traveled to this world. "Congratulations to the host for binding the summoner system." System, what are your abilities? Lin Ze called the system in his heart. "This system will transform the host into an invincible summoner." In an instant, a vast star map appeared in front of Lin Ze's eyes, with countless light spots flickering in and out of the void. Each point of light is wrapped in a figure of different shapes-- There is a thousand-foot-long nine-headed demonic dragon entrenched in the stars; There is an ancient Buddha standing on a lotus flower, holding the flower and smiling; We even saw a muscular giant wielding a giant ax and cleaving chaos... (The introduction is weak, please read the text.)