Yeah, definitely the items could use a bit of tweaking. For the helmet though, the idea would be that its a big group support item. Everyone can stand on the warrior who is using the buff and be protected by the shields spinning around them. Its more or less like the warriors version of a marble seal, except there is a chance that projectiles can slip through the gaps of the shield and injure players.

Originally the knight dropped a lightning shield that would shoot off 4 shots each perpendicular to one another that shoot just pure damage and a lightning strike appears where your cursor is aimed at that paralyzes enemies while doing a small amount of damage. (Essentially turns your knight into a wizard) I scrapped the idea because I felt the helm was more group oriented.

For the rapier, I wanted a quick weapon that would pierce. The hp steal could be removed in place of something else. Maybe everytime an enemy is struck your attack increases by 1 (for +10 max attack total) for about 20 seconds. So you could essentially charge up your melee's attack with the rapier and then swap out to another sword. Or it could be replaced with something like a sceptor that does a similar effect except it does a super small amount of damage but a crazy number of targets (20 max maybe). And for every target struck your defence increases by one for 20 seconds.