It’s quite easy to overlook the location of the fairy in the eastern vault location of Tunic. If you get out of shape, head straight south and down the main staircase. Go west until you reach the room with all the guardians. Once you’ve sent them and have some privacy to solve puzzles, it’s time to get to work.
Shift your attention to the energy node that you first activated here. Now it’s just a gray square on the floor.
Take note of the candles around the node. If you’ve done the tree puzzle for a fairy in Western Garden or the fountain puzzle in the Overworld, the solution will be familiar to you. However, if not, note the number of candles belonging to each cluster. One and four on the right side, three on the bottom, and so on. You must count each group of candles with your Holy Cross (D-pad on a controller, arrow keys on a keyboard). So you press right first because it has the one candle group. The left would be second because it has a group of two candles. And then you continue in this pattern.
Still not working? Here is the solution: right, left, down, right, up, left.
As a reminder, if you are having trouble finding the location, press up, left, up, right, down, right on the “Holy Cross” to send three sparks moving in the direction of the fairy .