I'm kind of new to DMing, but the Emerald Spire dungeon caught my eye and I decided to run it for our group. I didn't want to handle a fistfull of races though and therefore I asked the players to build human or half human characters. The bulk of the players are long time gamers who regularly brag about their old exploits, so I was pretty shocked when they hit the effect on the interior of the first level of the spire and immediately ran away.
They are insisting that the level is simply impossible for them as humans (nobody went half orc). They have a monk, a ranger, a sorcerer, a paladin, and a cleric all starting at first level.
My question to the good people here is this, are they right about being completely stymied, or should they be able to handle this?