Celtic Heroes

I'm lvl 66 and I have 16 knows. I'm wondering if I should start using them, or train to a higher lvl and then use them? I'm not sure. Help plz

Use at a higher level.

Save them for level 100, unless you plan on buying plat. If you are, use em at level 80

disagree use them at 85 when u start scorpions some prefer spiders but scorpions have much lower health