Hagraven's Garden is a heavy armor set. When you take damage while under 50% Health, you summon a preservation of nature around you for 5 seconds. Any damage you take from enemies outside of the preservation is reduced by 50%, and the first time an enemy tries to enter the preservation, they are knocked back 5 meters. This effect can occur once every 45 seconds.
The Hagraven's Garden set is part of the Horns of the Reach DLC. It drops in Bloodroot Forge in Craglorn. Each set item is bound on pickup. You can acquire light armor, weapons and jewelry of this set in the Bloodforge motif style.