[Alneyan]

-4 gives a +1 bonus to the check, 0 is normal, 5 gives -1, and every 5 levels add an extra -1 penalty.

Other than that, I think the area affected is a circle, with X being its radius (where X is equal to Fear value +5).

Liga's Manual Addendu has everything currently known about this effect, and that's what I am quoting from memory.