Glyph of Elemental Power broken?

Yesterday I tried this skill for the first time. It didn't work. The damage of fireball was the same with or without casting glyph of elemental power first. It supposed to raise the elemental attribute by 2 level, then the damage of fireball should be higher with it. But why I got the same yellow number floating up? Anyone experienced this before?

Nobody knows? Even nobody has ever used it?

I use it all the time for pvp spiking works all the time it only raises 3 to 4 hps usually witch is maby why u not noticing the diff but for me its great for air att. couse it raises it to 65 seconds.

Thanks for the reply, so it works for air magic. I'll do some more test to see whether it works or not for fire magic. I didn't try fire attune, I'll try that to see if the duration will increase.