As a hardcore Liltih player, I realize what it takes to take her down. I have seen Samael put a hurting on a Mature Neph before the thing could ever get close. But as a Lilith player, I know full and well that ranged models are my worst nightmare (thus extra terrain, hooray!). The Terror Tots are squishy but if they get a chance to grow, watch out. A lot of posts have been made about Lilith and the MN, but don't forget the Young Nephs. I have seen a pair of those do more hurt on an enemy crew than any Mature could muster. So, as they say, If the terrain allows, take as much heavy ranged as possible, and USE them. If not, the Nephilims are glass cannons, they usually rely on first blood to do their best, so try to take your heavy melee close enough to hit first and hard. And pick off those tots if you can!