... there's nothing in Fate/Zero by the name of Knight Tactics. That was only added in to Grand Order so Diarmuid had the necessary three skills, the entire concept of exploiting weaknesses is subsumed in EotM, and can only barely bridge the gap between Diarmuid and Saber--and he's hardly a pushover. It's not going to help an Assassin.

Could you please stop with giving unsolicited advice? It's likely to cause confusion and something that's [i]less[/i] suitable.