Thread:Kirito903/@comment-22439-20130407180639/@comment-6697950-20130407184228

Another would be defeating the boss with a small party, which yields an abnomal amount of valuable loot, but this is a very rare event, and I'm not sure if it ever happened, aside the 74th Floor Boss Battle. Other than that, the most common way to earn col for front line players is to kill mobs in the labyrinth (each kill nets a substantial amount of col on its own) and sell any acquired loot from them.

Oh, and when editing, please rememer that this is a wiki, not a blog, so you should try to use more of an objective an informative style while writing an article, as, otherwise, the article does not look so credible.