6 players 1st level, stats were 28 point buy from the PHB instead of the 22
Dragonborn fighter (longsword and heavy shield in scale) 18 str, 16 con
Tiefling paladin (battle axe, heavy shield, plate) 20 cha 14 con
Half Elf Warlord (longsword, light shield, scale) 18 cha 16 str
Dwarven Cleric (warhammer, chainmail) 18wis 16str
Tiefling infernal warlock (leather armor) 18 con 18 cha
Dragonborn Orb Wizard (orb) 18 int 16 con
We'd used a few or our encounter abilities on the fight outside with both the dragonbreaths and the fighters multiclassed thunderwave gone, also the wizards daily had gone from earlier that day. The DM also allowed us to spend an action point in this encounter as if we'd had a 5 min rest but didn't return any encounter powers.
I believe the fight was made appropriate for our party size with a dual wielding kobold from dragon making an appearance.
During the course of the fight most dailys missed

we formed a kind of wall at the entrance to the north (if going into the waterfall is west) and got flanked by 2 groups of kobolds, Bloodied condition was not rare with some well timed healing from the paladin cleric and warlord keeping us on our feet, when iron tooth came along he wasn't overly impressive until we bloodied him and he took down the cleric and the paladin in one round, with the warlord out of inspiring words it wasn't looking good, however the cleric rolled a natural 20 on his death check thingie spent the surge and was back on his feet, we managed to finish the fight with no casualties.
Was fun and felt dangerous, I'm not sure how much the +6 points for the point buy has helped us but i've put what I consider high stats up by the characters.