At recall in the Village of Lasler "sayto rufus ghost" and go west and wait.
After a couple of minutes you will be transferred to an area away from the main village. To the north there will be 5 obelisk. You need to make it so each of the obelisk shine the correct order. You change their colours by walking in and out of the rooms. The center obelisk will glow a certain amount of runes depending on how many you've got correct. Once all 4 light up, a north will open, go north and you'll get the Mark of Wisdom and 50 practices.
The easiest way to do this is to start at one end, let the color change then return to the middle to see if a rune glows. Rinse and repeat from both sides until all 4 runes glow in middle room.
Note: The pattern seems to change each time all 4 runes glow.