Try to Get More Maple Story Gold
You should try your best to get Maple Story gold in the Maple Story game. Ichoron only has three add phases and there are five defense crystals while the individual crystals can't be used more than once, so as long as the player simply moves to a fresh one before the next add phase, you've got the achievement in the bag filled with Maple Story gold.
Using the crystals is actually easier than DPSing each add down individually, clicking the crystals is the default means of handling the fight -- at least, that's been my experience having tanked the place for Maple Story Mesos what feels like millions of years. I'd be very surprised if you couldn't manage this in any random dungeon finder group. A good friend of mine went the better part of two months without once seeing Erekem, and an unfortunate player on Maple Storytook almost a year to get Maple Story gold. As for me, it was several weeks before I got a run where Ichoron spawned. These are all outliers though.