Rise of the Human Race: I Can Awaken the Ancient Spirits

[System, summoning, passion, large-scale battlefield, technology + development, no female protagonist or single female protagonist] The human world was invaded by aliens. Tens of thousands of years of war emptied out the foundation of the human race. Countless heroes died fighting to defend the human world. After exploring 100 ancient tombs, Ding Hong activated the undead system and obtained millions of skeleton warriors, while also awakening ancient heroic spirits. By consuming different spiritual fruits, the Skeleton Warrior can be upgraded to a Skeleton Fire Mage, Sniper, Assassin, Mutator, Curse Master... In addition to combat professions, there are also gardeners, alchemists, blacksmiths, mechanics... From then on, Ding Hong started the road of technological development! Open a spiritual fruit plantation, elixir production base, blacksmith shop, thermal weapon research and development base, new material research and development center, mecha research institute... Various weapons of war were created: Mechanic + Thunder Mage = Thunder Cannon Mechanic + Wind Mage + Fire Mage + Artilleryman = Wind and Fire 1st Generation Rocket Launcher Mechanic + Puppet Master + Psychic Master + Free Mage = Combined Mecha? Transforming mecha? Artificial intelligence armor=? Stealth-capable mana tank =? Teleportable Sky Carrier=? ? Ultimate weapon: two-way foil =? ? I have an extremely large machine factory that can produce any war weapons. My employees are all skeleton soldiers, working 24/7, never tired, no pay required! …