He can be found in the [[Skyrim:Aretino Residence|Aretino Residence]] constantly trying to call the Dark Brotherhood. While he actions remain the same, his dialogue rotates between several lines until you reveal yourself:
'''Aventus''': ''"Sweet Mother, Sweet Mother, send your child unto me, for the sins of the unworthy must be baptized in blood and fear."'' <br />
'''Aventus''': ''"Please... How long must I do this? I keep praying, Night Mother. Why won't you answer me?"'' <br />
'''Aventus''': ''"Die, Grelod! Die!"'' <br />
'''Aventus''': ''"So... Very tired..."'' <br />
'''Aventus''': ''"Grelod, you old crone. You'll get what you deserve ! The Dark Brotherhood will see to that !"''
When you talk to him and ask if he is all right he will be overjoyed and remark ''"It worked! I knew you'd come, I just knew it! I did the Black Sacrament, over and over. With the body and the... the things. And then you came! An assassin from the Dark Brotherhood."''