Hrm... I can do this in a more clever way... Sedrach decided to abandon his attempt for this night as well and return to his room for rest. The next day, he left his room through the door without disguise and went looking for a moneylender and a dealer in wands.

Knowledge Local (1d20+5)[6]
GI (1d20+13)[28]
I try to lend some money and get a half-charged divine wand of Silence.