User blog comment:Kyzero/Difficulty in events/@comment-5873677-20140823110230

The dungeon in the vortex has a completely good sphere reward, thus its completely hard. I'm level 89 and I still ca't beat level 3. Also, it's not one time only. In JP, that event is permanent I think, so you have unlimited time to complete that dungeon, just like the Trials. I'm a free player too. Also, I think it's quite fair for BF to have an elemental arena. So that while others can't participate fully, others are given a chance. And in turn, vice versa. :)