Not very often I give a 5.0, but this is well presented and well written, makes for an easy plug in to any horror game out there.
(Eso terrorists and Supernatural it would fit into easily)
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It'd be nice to see the god of eyes written up sometime, as it would make for an unique and nasty deity for characters to oppose.
The nasty curse for his followers to cast would be to force people to see visions of the future deaths of their loved ones. (a possible future only but the victims likely won't know that.)
This would work well on multiple levels. In game, its likely more horrifying for the characters to foresee the death of those they care about then of themselves.
Out of game players usually don't worry much about the gm railroading the deaths of their characters (rarely used tactic by any gm) but forcing the death of npc's in a particular manner happens plenty often, making this far more likely to be believed as an absolute future, rather then a possible one.