The Summoner Has Been Promised, What the Hell Is This Darkin Sword Demon?

[LOL elements + abilities + push all the way + invincible upgrades] The void invades, alien beasts run rampant, and demons from outside the territory are watching with eager eyes. In order to withstand these multiple crises, mankind is forced to open the genetic lock, and everyone has the opportunity to awaken superpowers at the age of 18. Lu Chen traveled through time, understood the summoning technique during the awakening ceremony of his senior year in high school, and obtained the S-level passive—Soul Contract! Unlike other summoners whose bodies are weak, Lu Chen can obtain all the abilities and attributes of his summons. Just... His summons seem to be different in hundreds of millions of ways! Others are tree demons, undead, monsters, and goblins. And what about Lu Chen? The irritable darkin brother holding a giant sword! A foul-mouthed yordle riding a lizard! The indomitable orphan wind swordsman! The Ninja Lightning Squirrel who has lived for nearly ten thousand years! Even the Star-casting Dragon King who rubs the planet with his hands and dominates the universe is Lu Chen's summon! Wait, Why is there a succubus here? ? This book is also called "A Darkin Greatsword at the Beginning, Do You Call This a Summoner?"