Sister Elena is an elderly nun in the Abbey of Saint Elspeth Citharede.
In the quest, she is the first victim to be murdered by The Killer while doing the quest. She also had a relationship with Valerio, although this was apparently finished when Sister Anna found the letters that were sent between them. However, Elena and Valerio still continued to have a secret relationship. She used the tunnel in the kitchen to sneak Valerio into the kitchen, which is also how the killer escaped after murdering her.
Concept art of Benita, Catherina, Cecilia, Debora and Elena.