Druids which he does have provide 54(base could be talented for a slight increase) more resistance to nature than not having a druid...so yes he does have a buff albeit a small one.

I just found junk gear on the AH to put myself to about 150 NR on my mixed team and it helped quite a bit, until I was able to out heal the dmg or nuke him down.

A shaman can help a ton with NR totem providing about 130 to the party, that is if you have one that wouldn't mind coming along. Once the healer and tank are good to go bring the DPS that sat out in for gear/badges.