Yeah maybe void but I like the idea of adding a new element to kind of diversify the roles against a greater number of enemies cause honestly how many void shields do you see? I'd say the explosion would be powerful enough to sweep off all the tier ones and get rid of a tier twos shield if in ward or half outside. Also it would be cool if an enemy was in the ward and didn't die that it got knocked back a good deal to give you some breathing room.