Im playing Elemental Archer at the moment, and doing the quest for the burning archer.. all seemed fine untill i had to kill beetles.

Harden Shell DOES reduce the damage these spirit arrows do, in my view that is not real spirit damage these arrows do with that ability... a normal spirit bolt goes through this Harden Shell...

Am i to use spirit bolt anyway even though i have spirit arrows?
I hope this was not intended but a bug since it seems pretty lame.