[Kamog]

You cannot take over the world in Call of Cthulhu. Even when you win, you don't win, you only delay the inevitable. There are only two possible ways your character will end up: (1) dead, or (2) permanently and completely insane. With a lot of work and some luck you can gain all sorts of powerful magic and mystical knowledge, but you go insane in the process. Once you lose too much SAN, your character is lost.

Call of Cthulhu is an unusual game in that it really doesn't pay to make a strong fighter-type character. You can be the toughest guy in the world and have tons of heavy weapons, and it's completely useless. The monsters and aliens are about a billion times more powerful and more intelligent than humans, and many of them cannot be hurt by physical means. Humans are only sane because they don't know the truth. It'a a rather hopeless situation you are in in that game.