Your DM is correct. And it is also true that 3e adventure design is for parties of 4 characters.Lorne said:In the two 3e groups that I currently attend, the parties number four and five characters, respectively. I don't know if this is a function of the personal tastes of the two DMs involved, or if there is a trend in adventure design under the current rules to have a smaller party (the DM of the 4-character party said it makes designing adventures easier; he cited that CRs are based on 4-character groups).
Qaballa said:I have 4-5, but I can't vote for that option