Fantasy Starts with Instant Kill

Killing people to level up, killing people to drop treasures, using heaven-defying skills, and rising to prominence are no problem for me. I only care about whether my future wife is the cool lady Valeela with white legs, or the elf sister of the Windrunner family, or I have trained a fair-skinned, beautiful and easy-to-push-over little loli since childhood. Oh, the hardest choice to make. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.