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The Terrain mastery is a custom ability that can be selected as the delver's quaternary ability. That's where the code above is found, set at Post-Levels, 1000 (sort of picked on a whim I still don't fully know which phase to use for what).
The favored terrain itself is bootstrapped on Deep Delver, a class ability gained at level 3; bootstrapped ID ftUndergro .
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