Well for years I have read about players using sparks on the behemoths, but I am dubious of it.I have sit there with 3 sparks characters and it is not working. Yes you can eventually kill one, not the Ancient ones though.
The problem is they have a never ending supply coming from the rear. I have never been able to find a way to get through without killing some of them and running around the rest.
You can go in the opposite direction and get in a safe places and kill a lot them, but in the end you still have to face some down in the channel.
