[Agrajag]

Quadruple bless strategy? I doubt it.
1) 500 Design Points are barely enough for Dual Bless, 800 is only 60% more Design Points, so how is that enough for a quadruple bless?
2) Even if you can squeeze in a quadruple bless, it would take really really bad scales (even worse than Dom2 Dual Bless), which would be a weakness (especially since Turmoil and Sloth will severely hinder your ability to produce holy units)
3) It would take certain units to pull off successfully, the only thing I can imagine for a quadruple bless (assuming blesses don't change) is W9F9N9E9, which would mean you have to have a high HP unit, preferably with elemental resistances and high encumberance.
4) It would still eventually be weaker than summoned troops, mages and SCs (especially combinations of those).

So I don't think quadruple blessing is going to be a problem.

Though obviously this is just guesswork, as I don't have the game and don't know how things are going to be like.