This is a passive ability; it does not need to be activated.
Requirements: Level 1. No previous level requirements.
Increases your armor class, attack power and the maximum amount of attack you can gain from items by 10 points per rank.
These Hero's lines look worthwhile and fun to complete, as a returning player how far back do these rewards span? I mean will completing Seeds of Destruction zones get ranks in these? I've only gotten one rank so far and it was from completing quests and missions in the new TDS Katta zone. I see 50 ranks available which makes me think maybe the last 8 or so expansions worth of questing may add a rank. Any clarity on what zones count toward getting these Hero's lines stacked up would be great!
This is increased each time you complete a zone in COTF or TDS (all tasks and missions for any given zone - some are split into multiple achievements).