- Not available on that edition (the reason is in the tooltip)
- Depends on the setting, your class or another addon (details in the tooltip)
What it does
Checks if you have chosen a hero talent tree, or the specific tree you pick.
Why you might use it
Give each hero talent tree its own priorities. Leave the tree blank to match once you have chosen any hero tree, or enter a tree's ID to match that tree only; the ID is also how a rotation shared with another class names it. Below the level that offers hero talents, or before you pick a tree, no tree is chosen. Retail only. See also Talent and Specialization.
Example
you have chosen a hero talent tree
Settings
What each setting in the condition editor means, from the game's own help.
The hero talent tree you have chosen. Pick a tree from the list, which shows the trees of the rotation's specialization, or choose 'Any hero talent tree' to match once you have chosen one. A tree can also be entered by its ID, to share a rotation with another class. Below the level that offers hero talents, or before you pick a tree, no tree is chosen. Retail only.