FGO NA - Tam Lin Lancelot 3 Turn Buster Farming Demonstration (SPOILER: True Name: MELUSINE)
Doing it on a wave 3 against Sabers to demonstrate her DISGUSTING damage. Black Grail is MLB at level 100.
Also don't be like me and forget to use her third skill ASAP. The NP damage up lasts for 3 turns not 1. Despite the clickbait title it was NOT a pro move...