From Fate/Grand Order Wiki
Lostbelt No.5.5 - Naraka Mandala, Heian-kyo - Thunderous Flash
Heian-kyo was released on December 4, 2020, on the JP server and on November 21, 2022 on EN. Heian-kyo 8th chapter of the Second Arc, Cosmos in the Lostbelt.
Main Story Clear Reward
- Holy Grail
- And Then, At Mount Ooe: receive 1 copy and it becomes unlocked for Story Summoning.