[Micah]

There's little point in investing in either D or F bless without good, offensively minded sacreds (Jags come to mind.) If you have more defense-oriented sacreds either bless is a waste compared to E/N/W for them, as you're not really playing to their strengths.

Since you're fielding somewhat fragile sacreds you're going to want to ramp up your kill speed to the max to cut through chaff as quickly as possible while the arrows and evocations rain down, and F beats D in that case hands down, just test it if you have any doubts. You're basically trying to play to your strengths here, instead of force-fitting a role on troops they have no business being in.

A D bless doesn't really change the math of if putting your sacreds vs an SC is a good plan...if they can kill it with a D bless they'll kill it with F bless most of the time too, and if they can't kill it you're going to be on the losing end of the exchange with a pile of dead sacreds compared to a beat-up but alive SC. If the D bless is really that much of a deterrent a good opponent will fall back behind a chaff screen and blast some holes in your sacreds from afar while your D blessed guys struggle to kill the chaff quickly. The D bless also has a harder time against PD, forcing you to raise your raiding squad size, which is one of the areas that sacreds shine at come mid-game once the evocations start getting too hot and heavy.