Ascent

You are walking along a railroad track through the wasteland. You are alone. You have no name. Your pockets contain a fortune in money taken from your opponents, as well as their weapons. You have been walking for some time, and your stamina is draining-you need to kill someone soon. Behind you: the grave you rose from, a massacre of your doing, and the lifeless body of your only friend. Somewhere before you: the mysterious Pyramid that might hold the secret to your past and abilities. The Pyramid appears on the horizon, a massive structure containing four levels. You must make your way to the top to have a chance of discovering your identity. You approach the gate, manned by armed guards. What do you do next?