i'm gonna try & make this quick. after the helloween event ended, literally no one does kolodion anymore, because of a few reasons.
1. the boss is simply not worth to do, especially when the chance of getting a rare item is 1/300 and when all the rare items are merely cosmetics. my suggestion is, add more rare items to the drop table, and introduce a new kind of weaponry to emps world - the venomous weapons. add a venomous bow, staff and a melee weapon to the drop table. the weapons would be pretty high tier.
2. despite it might being a pretty good source of resources to iron-men, the players are afraid to kill it anyway, because of massive teams of pkers, so expand the number of possible locations outside the wilderness, while still leaving a chance of kolodion spawning in the wilderness.
3. the boss is a little bit too easy at the moment. you could kill it alone without no effort what so ever with the crappiest gear there is. my suggestion would be to increase kolodion's hitpoints and increase it's damage dealt.