Elani can be saved as Iron Maiden to become an ally. She was the original Iron Maiden, the plain woman from the legend of Iron Madien who had a desire to help the wounded knight.
She is dressed in the unique armor which is very similar to the Iron Maiden's.
First Encounter: Forgotten Pacts - Hour of Silver - Iron Lady in the Sanctuary (DLC)
"I will do all I can to avoid confrontation." - Beginning of Phantom Quests.