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This spell is most effective on creatures which have a large damage range and, at Advanced and Expert level, stacks of troops with low damage but large numbers of creatures in them.
The +1 extra damage bonus from Advanced Water Magic is more beneficial to units that normally deal low damage as it's greater percentage of their base damage, so it's even more useful to low level units with high numbers and large damage bracket. Many 1st level units deal 1-3 damage values - Pikemen, Troglodytes, Sprites (Skeletons too, but as Undead, they cannot be Blessed). Harpies & Harpy Hags with 1-4 damage are perhaps most affected, as Advanced Bless causes them to deal 5 damage instead of 1-4, average 2,5, doubling their output. Air Elementals & Storm Elementals deal similarly proportioned 2-8 damage.
Because of its mechanic, normal and basic Bless is useless to cast on troops with fixed damage value like Nagas or Angels. Advanced Bless has a very minor effect, as 1 point of damage more or less is negligible amount on such troops.
Heroes with Bless as a starting spell:
Heroes with Bless as a specialty:
Units immune to Bless: