I found the Legendary Deathclaw at Dead Wind Cavern. Despite handling the other deathclaws rather easily with my Q-35 Matter Modulator and the Anti-Material Rifle, the Legendary Deathclaw pwns me and my crew every darn time (usually in one or two swings). I was thinking about going back there and mini-nuking it. I also had Raul in my party and I'm wondering if Boone would be better help for this kill. Any advice on how to beat this beast?