Spoiler: Oh joy
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Blackhawk participates in the Holy Grail War of Honolulu as the master of Assassin

The Servants participating in this war are:

Saber：Yagyu Munenori
Archer：Anne Bonny and Mary Read
Lancer：Musashibou Benkei
Rider：Artoria Pendragon (Alter)
Caster：Skadi
Assassin：Nitocris
Berserker：Cú Chulainn (Alter)
Extra class：None

...well, i get to fight Cu Alter. Oh joy.