Decaying Defender Outfits Quest
This quest has no legend.
Location
All the locations of the Rotten Blood Quest.
Reward
Dangers
1Base Outfits
Finish the Rotten Blood Quest by defeating Bakragore.
First Addon
Use a piece of Cursed Wood. 
Second Addon
Use a Darklight Geode. 
Upon using both items you will get the achievement Fully Decayed.