servant detection

"Yes. I depend on you for that, Saber. If we come near a Servant, can you notice it?"

"Well... That is correct."

Dematerialized or not, Servants can perceive the presence of other Servants. Of course, everyone has their own affinity with searching for the enemy, and there are those like Assassin who have the ability to erase their presence.

"In my case, I am able to perceive a presence in a radius of up to roughly 200 meters. Also, an opponent with the proper ability could tamper with that."

- Fate/Zero: Act 3, Part 2