If she was telling the truth that she knew what Elina was then she could believe her based on just her otherworldly beauty alone. 

"My name is Luna Geisher." She smiles.

Elina nods her head and slowly sits across from Luna on the arm chair. "Elina Steins" 

Luna smiles wider. "I'm a friend of your new neighbor."

Elina frowns. "There's no one on this floor besides me."

Luna shakes her head. "I know, I'm a friend of the one below you but I sensed something strange about you." She narrows her eyes. "Actually the choker. I sensed the choker." She points to Elina. "The one behind your back."

Elina slowly draws it out from behind her back and lays it across her lap in defeat.

"Oh I understand why you had it ready, no need to look so ashamed but you wouldn't have won with that." Her eyes shine as she leans forward. "Not against an Iris." 

"You're an Iris?" Elina mumbles.

Luna pulls a silver chain from her sleeve then drops it straight down revealing a pitch black sword. "A better one than whoever gave you that dagger." She places the tip of her sword on the floor and leans her hands on the handles. "Now tell me who gave you that dagger?"

Elina falls silent then opens her hands. "First who are you and what am I."

Luna's smile falters then falls as she speaks. "I am an Iris, number twenty six out of the three hundred that exist. What you have there is a weapon that only Iris's can utilize called a Sepal meaning you are an Iris." She tilts her head pherhaps just one who hasn't gained her past memories. This can happen at times when we die and get reincarnated. Still it is peculiar we haven't met and the Iris who gave you this didn't wake you up." She ponders on this for a moment but continue. "They could have just been a low rank Iris who didn't know how, whatever the matter I can help you if you would allow me to look at your Sepal."

Elina clutches the dagger tighter considering her options. Neto wasn't going to tell her anytime soon that was apparent and if she really did have past lives maybe she should regain those memories. Maybe they'd help her.

Elina raises the dagger slowly passing it to Luna's now outreached hand. 

Just as Luna's fingertips brush the blade a spark appears then runs up Luna's body making her Sepal turn back to a chain and her body fall limp.