I Feel Like I Am Suddenly Invincible by Killing Enemies to Increase My Attributes.

My name is Karen, and I am a time traveler? He was reborn in another world and became the third son of the Earl of Golden Rose family. However, he had been marginalized all year round. In order not to be killed by his eldest brother, he had no choice but to join the army with tears in his eyes and become a fill-in in the Blackstone defense line. Just when he was ready to die, after killing the first goblin, the killing system suddenly activated. Although it was somewhat man-machine, Karen discovered that as long as he killed the enemy, he could infinitely add free attributes, so his style of painting completely changed. In order to increase his attributes, Karen kept killing demons, demons, dragons, demigods, and #%&... As he continued to kill, he gradually came into contact with the truth about the world and his own system—— The world is already riddled with holes, including those "gods" who steal power, alien gods and abyss demons who covet the origin of the world. There are also the failed promotion paths learned from Generation Kill, as well as the price that needs to be paid for promotion... Facing these difficulties, Karen just smiled and said, "It's very simple. If I am invincible, it will be over!" There are many female protagonists in this book o-o