If you can control mobs the spider cave build is pretty solid for group fow and you can garantee them success in the spider cave.
something like:
cyclone axe
cleave/defy pain
executioners strike/penetrating blow
elemental resistance
physical resistance
dolyak signet
healing signet
rez sig instead of sprint as you are with a group
or for monk maybe
cyclone axe
penetrating blow
executioners strike
defy pain
dolyak signet/any good stance
healing signet
balthazars spirit
rez
in fow the warrior is there more for a tank than a damage dealer these builds allow you to do both at the same time.
1. frenzy/cyclone axe - bring frenzy if you know when to use it
2. executioners
3. penetrating blow
4. dolyak sig - for tanking those abyssals
5. heal sig
6. smite hex - your team will thank you for it, too much SS going around
7. "i will survive" - spiders giving you disease? "i will survive"! ...and the monks can focus on other team members who are diseased as well
8. rebirth