Honestly? Massed DL and you can't go wrong. It'll take 8.57 Dark Lance's to kill the thing, assuming BS 4+, which is hardly a challenge for us to get (Hell, my normal 2000 point list has 17.)
Hilariously, it's reroll saves ability is useless against us, due to it having a 7+ save due to our AP.
"Death solves all problems. No man, no problem."