Fate/Zero Season 1 Episode 12

Invitation of the Holy Grail

Thanks to the information provided by the Assassins due to their sacrifice, Tokiomi and Kirei now know about Rider's Noble Phantasm and decides to let him attack the other servants first before engaging him. With Maiya transporting Iri and Saber to their new headquarters, Kiritsugu reviews his current information about the other contestants whereabouts. At their new headquarters, an old dojo, Saber notices that Iri has not touch anything and asking others to do tasks she normally does which Iri reveals she has become weaker possibly because she is a homunculus but she assures Saber she is fine and ask her to help prepare a defensive spell at the dojo. Returning to his room, Kirei tells Archer that he is no longer a Master due to the Assassins death and his Command Spells gone which will return to the Grail or given to his father the war's moderator. Archer ask Kirei about the favor he ask in spying the other Masters and notices that Kirei has taken an interest with Kariya when he isn't an important threat which Archer concludes what Kirei desires are; he enjoys seeing the pain and suffering of others. After Archer convinces Kirei of his desires, his Command Spells returns which suggest the Grail still has a use for him but since he has no Servant, Archer gives a subtle hint on which Master he should kill.