Per the Wiki, Im not sure if you have or haven't done any of these...
First off, know this, if you have done any of the following:
- Participated with any battle in the Plane of Growth
- Killed the Millers in Qeynos Hills
- Killed Holly Windstalker in Qeynos Hills
- Killed Druids at a druid circle
- Killed Treants
Then you will most likely have faction issues to correct in order to complete the epic. It's tedious, but it can be done.
Also it states on the wiki for the other parts that you have to be 50+ ( tellin darkforest ) and
Quote:
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The Cleansed Spirit of Faydwer
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Find a pained unicorn wandering in the Lesser Faydark north of 0, 0.
NOTE: the unicorn will not respond to you or take any items from you until you are at least level 46.
So maybe the tree checked your level just like the unicorn does?