Game Invasion, I Can Summon the Boss

[Game invasion + upgrade flow + decisive killing + no heroine + summoning side push flow + Western fantasy, fantasy and high martial arts hybrid] Su Chen unfortunately awakens as a "Monster Summoner" in the sewers and is about to be sold into slavery in a mine by his second uncle who has taken over the family property! So Xin awakened three hidden professional skills! "Killing will definitely summon you!" "The dead return and are resurrected infinitely!" "The ghostly upper body perfectly borrows the BOSS's ability!" … What should I do if I see a powerful boss and drool at it? It doesn't matter, just get rid of it, and you will definitely summon it next time, and take it as your little brother! What should I do if my younger brother is hacked to death? It doesn't matter, I'll give myself a headache and resurrect my little brother! What should I do if someone shows up and wants to kill me as a summoner? It doesn't matter, activate the ghost upper body and immediately transform into a humanoid boss. The left fist does high damage and the right fist does high damage! Slowly, Su Chen discovered that he seemed to have too many contracted monster brothers... Moreover, they turned into humans?