It doesn't help, your projectiles go right by or seemingly through Giant Bats, Mudsuckers, Vampire Bats, and Flying Foxes. I have it modded Salvo, Lock, Vulnerable. BFG seraphim was one of the first characters I played when Sacred 2 came out on consoles, and I always had to resort to other things than the BFG to kill them, usually I kept a sword/shield on me or used RP->FN. Just to make sure, shortly after I read that post, I took my level 78 seraphim into bronze and ran to the cave for the Tutorial Hirelings quest and tried it on the Giant Bats, and could only hit them with it when they where swooping into me.