Doomsday: I Have an Arsenal

At the beginning, we travel to the Frost Age, where medical equipment is extremely scarce and cold weapons are missing... Humanity is facing a huge crisis. Once you get sick, you may face death... A young man comes from time travel and is bound to the system at the beginning "Rewards have been distributed! Sign-in completed!" "Reward: Type 91 anti-personnel mine!" "Reward: The right to purchase standard military uniforms!" "Reward: System Mall!" "Reward: Medical skills!" Good guy, after completing the mission, can you get various rewards by signing in? In the age of frost, I directly call myself the emperor! Everyone cast envious glances: "He can cure diseases and has various advanced weapons, 666!" "Brother, can you take me with you?" "The contemporary miracle doctor Hua Tuo! The top military king!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.