[quote=@vancexentan]
Regarding the spells:

Purple Eyes: What can it do exactly? I'm getting a sort of Batman investigation mode from the Arkham series vibe from it but I could be wrong.

I'm not sure about the curses they all seem easily broken you can freeze the blood inside the human body that is alive. You can also boil them from the inside out. It's touch activated but that means the second you touch an enemy servant, or master they're pretty fucked unless I'm misunderstanding the concept.

Also doesn't Mana Dowsing flat out negate the attempt to hide from your master?
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His Pure Eyes are basically retrocognition/psychometry. The curses are, imo, balanced by the fact that no human is going to get close enough to touch a Servant without the element of surprise and a lot of luck, and half of them have Mag. Resistance anyway. As for Masters, it takes a five-line incantation even once you're touching them, so unless you've got them in a headlock or have recently German suplexed them into unconsciousness, it'll be difficult to hang on long enough to complete the incantation. And even if you start the incantation ahead of time, that'll be their cue to stay the hell away. It's a spell that requires the enemy already be incapacitated or inconvenienced in some way for it to work (although once it does, it is basically instant death unless you can come up with a counter-magic in the few minutes/seconds you have before you die).

As for Mana Dowsing, in order to locate specific items or people, you need to know what you're looking for. You can't just say "find Masters" and get results (although you could filter your search results by elevated mana leakage, but that's still guesswork). Plus pinpoint accuracy only works within 50m, so you can basically find someone who's hiding in the same building as you but not much more than that.