Na verdade, esse encontro está muito acima do nível esperado dos personagens. Um dos escritores, Steve Winter também falou um pouco sobre o equilíbrio do encontro e a história do design.
Em uma postagem ( postagem como Huscarl ) nos fóruns da WotC, Steve Winter escreveu sobre o encontro "No Room at the Inn":
[in] The original version ... the villains were not assassins but young green slaads polymorphed into human form.
... then young green slaads disappeared from the MM and we were instructed not to use them in this encounter. We cast around for alternatives and found no really good ones, but assassins were at least close to the slaads in power -- as they were then written.
... By the time the monster stat blocks were finalized, assassins wound up significantly more powerful than the original slaads or even than assassins had been when they were chosen as the slaads' replacement.
Ênfase minha.
Ele, então, lista as possíveis mudanças no encontro que o deixariam mais alinhado com o nível de festa esperado naquele ponto da história.