I like this list very much as I already said WraithLord, so if I can help I'll add, and maybe correct, something. I didn't mention the ones already said by vfb.
Air:
Units:
Thunder Ward, (a lesser Storm Warriors) increases by 50% the SR of some units (Range 5, AoE 15), Enchantment 5, A2 1A gem
Astral
Resist Magic increases caster's MR by 4 (manual)
Astral Shield is said to be Enchantment 3, and that deals even a "paralyzing damage" (?)
Communion Master and Communion Slave can be considered buffs?
If you include Doom on the list, we shall consider the many others that "negative buff" enemies? (Spirit Curse, Curse, Seven Year Fever, Mist, Slime, Rain, Rust Mist, Destruction, Iron Bane, Demon Cleansing...) Maybe better not?
Celestial Music is Bandar Log only. Gives quickness to all Apsaras, Gandharvas and Yakshas.
Battlefield
Light of the Northern Star(!), All mages in the battlefield (even enemies) gain 1 point of Astral, Conjuration 4, S3 1S gem
Blood
Sabbath Master and Sabbath Slave?
Both Blood lust and Rush of Strength increase the strenght of their respective target by 4 (manual)
Earth
Summon Earthpower also gives Reinvig+4
Stoneskin is CR malus of 50% (manual)
Ironskin is 20 protection or +3 if already greater, and 75% SR malus (manual)
Invulnerability is said to be (manual) 25 protection, not 30, and gives PR 100% malus
Legions of steel gives more than +3 protection, as it is applied at every armor part.
Iron Will: MR +4 (manual)
Strenght of Giants is +4, not +3
Both Army of Gold and Army of Lead give Ironskin (doesn't stack!), and Army of Lead MR+4 (manual)
Tempering the Will is just for MA Ulm so I would specify this in the list. Anyway, it gives MR+4 to all *national* units.
Iron Marionettes is just LA Agarthan as well. It's not Battlefiel wide but affects a wide area. It gives Att+4 and Action Points + 4 to undeads (who said "Umbrals even better" ?
), while I don't know if it is applied even to enemy undeads.
End of Weakness is just for Yomi, but I think it is not known if it affects even enemy demons.
Units:
Earth Might: (Range 15 AoE 1) units get +4 strenght, Alteration 1, E2
Fire
Flaming Arrows are also magical
Inner Furnace is anyway castable by Abysia only
End of Culture avaible only to Yomi and equally not known if it affects even enemy demons.
Nature
Eagle Eyes precision +5
Wooden Warriors gives some units Barkskin.
Self:
Strenght of Gaia (!), caster gains Personal Regeneration, Str+4, Barkskin, +1 Nature Bonus (and a coffee at Starbucks?
), Conjuration 4, N3E1
Units:
Mossbody, units nearby have 75% chance of receiving from 10 to 20 points of Prot, if affected unit is damaged releases an AoE 4, 1AN poison damage, Alteration 3, N1W1
Healing Mists, a 3 rounds lasting mist which heals all units inside the AoE to full HP, Evocation 5, N3A1
Song of Bravery, MA Man only, from +1 to +5 morale, Enchantment 0, N1
Battlefield:
Growing Fury, all friendly units wounded or with berserker tag go berserker - enemy berserker tagged unit as 5% every round to go berserker too, Thaumaturgy 4, N4, 1N gem
Relief, +1 reinvig to all friendly units, Enchantment 6, N5, 1N gem
Gaia's Blessing (!), +50% FR, CR, SR, PR, Enchantment 9, N6E2, 3N gems.
Water
Water Shield is Def+5
Winter Ward is 100% CR, not 50% (manual)
Self:
Resist Fire, 100% FR, Alteration 1, W1E1
Units:
Fire Ward, 100% FR, Alteration 4, W2E2, 1N gem
Battlefield:
Friendly currents: friendly units have Action Points +4 and Enc -2, enemy units Action Points -4 and Enc+2, underwater only, Enchantment 5, W2, 1W gem
That's all I think
Hope I have helped.
Peace