Yeah, the only one that stands out is
Shield Other, which causes the caster to take half of the subject's damage.
Depending on implementation, this could be anywhere from hugely useful to downright game-breakingly powerful. The description doesn't actually specify what happens if a dozen paladins, clerics, and favored souls (it's a level 2 cleric spell, as well) start casting Shield Other on each other.
If characters Al and Barbara cast Shield other on Christine, do all three suffer 50% of Christine's damage? Or maybe it should be 33.3% each? Or maybe Al suffers half, then Barbara suffers half of the remaining half, so it's Al: 50%, Barbara: 25%, Christine: 25%.
Then what happens if Al and Barbara cast Shield Other on each other? Applying the spell's description literally, the exact result depends on whether and when variables are re-checked. Possibilities include:
If Al gets hit:
Al takes 50%; Barbara takes 50%
Al takes 50%; Barbara takes 0%
Al takes limit as x->infinity of (the sum of ((1/2)^N), where N goes from 1 to x). In other words, 100%. Barbara takes 1 minus the above sum, or 0%.
Also, whose damage reduction is applied, and when? If it's a spiritual link, when my Lord of Blades Favored Soul casts it, damage to the subject should get under the favored soul's adamantine shell; however, his fire resistance is inherent and should presumably apply to spiritual fire.
So, yeah. Fun spell! And that's saying nothing of its freakish ability to divide the hitpoint needs of a boss tank across a band of mass-healing-aura clerics.