Undaunted Mettle increases your maximum Health, Stamina, and Magicka for each type of armor you have equipped, to a total of 3%, or 6% with a second point invested in this passive.
- Each of the armor skill lines have passives which require five pieces, and there are seven armor slots. However, there are other passives in each armor skill line that only require one piece to be worn. To take full advantage of all these passives you should wear five of your preferred armor, and one each of the other two types. This approach is very skill-point expensive, so it may be wiser to invest in just two skill lines to get the maximum from both.