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Woodsmans Task Force (the Eden Trial) and the Maren MacGregor Task Force (aka the Sewer Trial) now have choice tables upon completion. Choice can be a Task Force recipe (i.e. a recipe from the Task Force pool), or the Multi-aspect Enhancement reward that these missions have normally given. Choosing the recipe counts as your once every three hours Task Force recipe reward for that character.
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Part of the patch notes from 5/24/2007, and I know from personal experience that the eden trial has dropped me TF only recipes in the past(a Lotg +5% and a Numina Unique to be exact) I haven't done the Cavern of Transendance since before inventions came out so I don't know wether or not it is actully dropping trial or TF drops.