Hand them in when your bags are completely full of them.
Also be aware gnoll fang exp got a nerf mid kunark, pre mid kunark the exp reward was much higher. but they're still decent I hear.
imo wisps with a good magic weapon for G.lightstones are a better option now-a-days. Crushbone belts are another option. skip shoulder pads imo.
Some crazy kids talk about a bread quest too I hear.
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