The latest limited event for mobile strategy RPG The Alchemist Code is a treat for fans of the Fate/Stay Night series. In this ongoing collaboration, which ends on May 2, players get the chance to summon characters from Fate/Stay Night [Unlimited Blade Works].
In terms of units, you can get Archer for free. If you want to enhance his abilities, you can collect Archer Soul Shards by playing through the Fate/Stay Night [Unlimited Blade Works] main event quest. You will also have the chance to summon Saber, Gilgamesh, Rin Tohsaka, and Illyasviel.
Aside from them, there are also three special collaboration units you can summon, and they are a fusion of The Alchemist Code characters and Fate/Stay Night servant classes: Rider Yomi, Saber Lamia, and Archer Zahar. If you max out these characters, you'll unlock their unique classes, like Berseker, Lancer, and Assassin.
The event also allows players to transmute and summon iconic weapons and units. These are Saber's Excalibur, Archer's Kanshou and Bakuya Swords, Gilgamesh's Gate of Babylon, Rin Tohsaka's Pendant, and Illyasviel's Storch Ritter.