This item can be attained from quests:
Per patch 1.68:
- Players will now be able to earn experience from RvR for every artifact. The PvE requirements will still work, allowing players to choose whether to continue following the PvE requirement or to engage in RvR. None of the changes involving the addition of RvR requirements to the artifacts will have any effect on Gaheris players.
(Earns exp: Slaying many types of plant-like enemies)
Artifact also levels from RvR and mobs in ToA Dungeons, as per patch 1.71.
Per Patch 1.81:
- Alvarus' Leggings now have 36 hit points and 4 Constitution Cap in addition to it's prior stats.
Artifact will gain new abilities at level 1