PC on Grinning Recurve (rare inscription)

Zealous Grinning Recurve Bow
Req 12, non inscribable gold
+15% Damage
-1 Energy Regeneration
+1 energy on hit
-1 Energy Regeneration

I have never encountered this +15% -1 energy regen before.

merch.... 15/-1e is rare mod but its worthless if its not on a low req weapon [req7/8, maybe 9]