Put the yellow stone to the yellow socket. Pick another yellow stone and two red stones. Go down. Locate a button in the wall to open yet another side of the room. Put a red stone in the socket and get two purple stones. Put one purple stone on the socket to open another secret area in the room.
This game does not have traditional skill tree you have to reset in order to change traits. Once you have unlocked all your traits at lvl 80 you are able to swap them at any time you want. And to answer the question: No you can not reset your skills/traits. This might be a slight inconvenience while leveling, but not a problem when you hit lvl 80. . 537 115 918 19 895 44 575 220