Powder Special Not Working

I recently obtained two tier IV powders and applied them to my spear on my warrior profile. I read in the powder manual that when you attack an enemy, it will charge up, and then you activate the special with [Shift+Left Click], though when I tried to do this, nothing happened. I tried everything I could to fix this problem, but it persists. Someone please help!

 

Are you sure you are attacking an aggressive mob and not a passive one?

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And are the powders both the same element?

 

You can't attack npcs to charge it. Attack some enemy's and don't unequip your spear

 

No they are not, actually. One is an earth powder, and the other is lighting.

 

That's your problem. You need 2 of the same element over tier 4 to use a special.

 

Oh ok. Thank you very much!