The FGO Holy Grail can be obtained through activities such as Valentine's Day, Permafrost Empire, Age of Ice and Fire, Imperial City Holy Grail Tales, Swimsuit Issue 3, Flash Festival, etc. Players only need to wait until the event starts and complete the corresponding tasks to obtain it.
How to get the Holy Grail in FGO
Valentine's Day event, Permafrost Empire, Age of Ice and Fire, Imperial City Holy Grail Tales, Swimsuit Issue 3, Flash Festival, FA Linkage, CCC Re-enactment, Halloween Issue 4, Christmas Issue 4, Red Beauty under the Moon, Yama The Story of Tei Nosei, Tokugawa Kaiten's Labyrinth of Oku, Lady Lenise's Incident Book, The Investigation of Mysterious Myeho-sou, etc.