So far, my group's had a lot of trouble getting one more combat in a five-hour session. Everything other than a minion takes a metric ton of damage to bring down, and things get much worse if an elite comes into the fray.
My last encounter was three 10th-level characters pitted against a galeb duhr and a bulette. It was only a 1400 XP encounter (not quite even 10th level) but the party still wound up giving up on the bulette and leaving. They weren't too badly hurt, they were just bored with trying to deal 204 points of damage after having exhausted the galeb duhr's 111.
I would like to know what the race / class combinations were for this encounter. Party makeup can have a pretty big impact in this case.
Typical 10th level attack bonus: +10 (+5 for level, +3 for attribute, +2 for Wpn Proficiency).
The monsters at a glance:
Bulette: HP 204; AC 27; Fortitude 26, Reflex 21, Will 21; Has 2nd wind for 51 extra hp
Galeb Duhr: HP 73; AC 22; Fortitude 23, Reflex 18, Will 20
Both can burrow
At a glance, the Bulette is going to be extraordinarily difficult to damage if the players are unable to target the Will or Reflex defences. Even if your flanking the Bulette, your going to need to hit 15 or better to land a shot on him. But the strikers (Warlock using Eldritch blast and Rogue using Piercing strike) can land a hit on 11 or higher. Your Cleric (Lance of faith, Sacred Flame), and your Wizard (Scorching Burst, Cloud of Daggers) can also target Reflex. I would guess that other than doing everything possible to keep your strikers alive, the Bulette should not be unduly difficult to take down.
The Galeb Duhr, however, should not be that difficult to take down. His def scores are not too high for 10th level characters, regardless of the attack type.
I will say though, that if the DM running the fight is determined to make life difficult, he can negate many of the players attacks by opting to spend as much time under ground as possible.
END COMMUNICATION