1. Shield -30% damage - banal
2. Stone Skin +6 to all on Expert - banal
3. Mass Bless - banal
4. Bloodlust +6 attack to all - an option
5. Mass Haste - banal
6. Mass Heal - I don't believe it
7. Fortune +2 luck to all - possibly an option, but not very effective
P.S. Maybe it was Expert Quicksand after all? :D (8 sand traps are randomly placed on the battlefield, stopping enemies in their tracks after they touch them. The traps are invisible to the enemy, except for units on their "native" surface, and after "activation".)
Although, protection from fire should work just as well... but I don't think either of them will work against flying dragons...
...ask Captain