Shalltear Bloodfallen is out on a mission, when she spots you and your party, she rushes in and quickly kills your freinds, but surprisingly leaves you alive

She then puts her finger to her head and talks to someone (Ainz Ooal Gown), asking to bring someone into The Grand Tomb of Nazarick

"Oh, you are coming with me dear adventurer"

Shalltear states while opening a Portal Gate and grabbing your wrist