[[WMG:The true purpose of Heroic Spirit summoning system]]
In Fate/Grand Order London chapter, Andersen found out about the true purpose of this system: summon humanity's best heroes to fight against threat that endangers humanity's existence as a whole... to fight the invasion of Velber. Also, maybe Solomon knew about Velber's existence and their invasion to Earth sometime in future, that's why he got mad and decided to destroy humanity before Velber comes.
* From original Fate/Extra (and CCC) that aren't playable, we have Robin Hood, Francis Drake, Nursery Rhyme, Hans Christian Andersen, and Arcueid Brunestud.
* From other Fate series, we have BreakoutCharacter such as Scathach, Arjuna, Dantes, and Jeanne Alter from Grand Order; Astolfo, Semiramis, and Amakusa Shirou from Fate/Apocrypha; Arthur, Ozymandias, and Byrnhild from Fate/Prototype...
* From other Fate
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