So it's basically a really long range motion detector.
Looks almost ok, just a couple things.
First :
Supersenses 10 (Detect (moving size -2 objects/creatures), ranged, accurate 2, acute 1, extended 4) - subtle 2 Concentration -1/rank; Tiring -1/rank. -> 5pp
That's actually only 9 ranks. Detect 1 + ranged 1 + Accurate 2 + Acute 1 + Extended 4 = 9 ranks. The subtle 2 is a modifier.
Secondly, I don't like Acute on this, I see no reason why a motion-detecting spell would tell fine details.
That would put it down to 8 ranks at -2/rank , so 3 pts +2 subtle = 5 pp.
that works fine.
Also by my math, a 5pp ritual would take 4 minutes to create{4 hrs per point X 5 = 20 hours. That's above 16 hrs(rank 13), so it's a rank 14 time period. -9 quickness=5 which is 4 minutes.} = and one full round (6 seconds) to cast.
If that's OK with VV, just post up the death god coming to the realization of what to do and casting it, or if you plan on going with one of the power stunts or another ritual, post that. In any case, I'll post up the results as soon as I can afterwards.