Event duration: December 26th 4:00 - January 4th 3:59 UTC
Draw rates for the following cards have been increased for the duration of the event:
- Nikola Tesla (Archer, 5★)
- Artoria Pendragon (Lancer Alter) (Lancer, 4★)
Both servants will be unlocked for everyone even if you haven't cleared London for the duration of the event.