arjuna alter (festival outfit) (fate)
Heroic Spirit Festive Outfit Craft Essence for Arjuna Alter
Part of a series of 39 Fate/Grand Order Summer 2019 CEs celebrating the game's fourth anniversary, each featuring a different Servant in an outfit matching the theme of one of the festival's attractions Chaldea Palace, Luluhawa Island, Battle Arena, and Halloween Town.
This tag implicates arjuna_alter_(fate) (learn more).