A Brash Brother Quest Spoiler
Many people seem unable to find the crested axe needed to complete this quest so below is a detailed description that will take you right to it. As I said about the Temple of Azra, I hesitate to include this and I encourage you all to search for it on your own. If you just search systematically through the swamplands you will find it without any problem - that's what I did to find it. Nevertheless, if you are well and truly unable to find it, here is the way to it.
Enter the swamplands. There is a lake in front of you - go around the right side of this lake and travel to the spot where a large tree has fallen and is laying diagonally from the ground up into the trees (yes, there will also be another tree in front of you slightly to the right that has fallen but you don't need to travel that far). From there, turn left and travel around the bottom of a lake to a tree with an "S" shape on the trunk. Continue going to the left around the tree and the bottom of another lake to a group of four trees and two rocks. Phtok and the crested axe is on the left side of the rocks under a tree.