Woo boy, can of worms.
FIT OF ENERGY
I don't use it that much, but I believe Fit of Energy gives you another turn to attack. You never cast it in the beginning. You cast it after your stack has already moved. Think of it like a Second Wind from Paladins. Can be handy for super damaging high critical archers.
PYGMY
Pygmy is perhaps one of the best spells for me.
Pygmy reduces the enemy attack power by a significant amount and lowers the HP, which means you can spell nuke for additional damage.
All your spells will now do 66.6% more damage.
I believe it was... DG? Or perhaps Impy... one of them told me their old combo.
Pygmy + Death Star.
That said, I would sometimes use a stoneskined unit to smash into a pygmied enemy, knowing that their retaliation would be weakened.
Also, Helplessness does you NO good if your attack is +60 over their defense, so you need to use Pygmy to do an additional 66.6% damage over your 200% damage boost from +60 attack over defense.
I would commonly use Pygmy for my Warrior Pure Archer attack team since I would routinely have +60 attack over their defense.
PRECISION
Precision - sometimes this is useful for pure archer teams since it will last longer and lets you hit anyone. If you use a de-buff, you might "overkill" that stack. I agree it isn't that best though.
BERSERKER
Berseker - excellent to use for Demonologists demonic summons.
DOOM
Ok, I agree this is sometimes not as useful especially since I usually have a high critical hit rate. Do not forget though, criticals count as a "bless" spell too!
PEACEFULNESS
Use it with Sacrifice.
LIFELIGHT
Agree with Zechno. You have no idea how awesome this spell is when you roll with the Shrek Team (Ogres, Trolls, and Orc Chieftains).
PAIN MIRROR
Archdemons that Halve you would strongly disagree about the power of Pain Mirror.
Agreed that some of my armies can cope with the Archdemons enough so it is not necessary, but some of my armies cannot, and Pain Mirror helps tremendously in that regard.