Go to door and press space and talk to the old man by pressing space to start, wait through the whole dialogue. It is recommended you leave immediately after he finishes his dialogue E to use a spell (if you have one) Click to swing your weapon (if you have one) Move with WASD Space to interact up arrow to chant (increase attack power) r to roll
In a way, a sequel to you Vs Chris prat, the unfinished game There are 3 secrets in the game.