Sugar-Lips Habasi tasks the Nerevarine with finding the fellow Master of Security in Balmora, and all that she knows is that he is an Altmer. It is discovered that Hecerinde is in fact the person she is looking for. He admits that he has neglected his duties, and he agrees to help her.
Hecerinde is the Master Trainer for the Security skill, as well as providing training in Acrobatics and Sneak. However, he provides these services only to members of the Thieves Guild who have achieved or indeed surpassed the rank of Blackcap.