Oz's Flame Gear after Jump?

However, I have no idea what the damage change from 15% to 40% is referring to, since nothing does 15%. It's worded as a damage increase, so I hope it's good.

That part confused me as well.

The Jump update mentions skill duration instead of damage of time so I assumed that they redesigned Flame Gear into having 15 seconds of 15% DoT at level 1 to 40 seconds of 40% DoT at level 5.