1st : is a needed for red chaos medal, and is the rarest of the chaos equipment drops
2nd : is a really good piece of gear from lvl 5 to lvl 9, bcs it's stats is just much better than lvl 5 helmet + the life regen passive
(example : this is my helmet
http://warofdragons.com/artifact_info.ph…ct_id=442545069 stats are not even comparable to that)
3rd : actually there is no third point, kinda overwrite xD
peace
just personal opinion, you can deal with enemies even without that, but if u want be extreme you can check it out, seems price run around 1k gold on human side, mag side even more
good luck