*Cracks knuckles* Let's get dis started.
Spiritual Hammer: This spell will summon a magical hammer to be either thrown or used in melee. The melee and thrown modes are switched by the usual "X" key. Please note that if you only can afford one hammer, you won't be able to throw it, so you'll need at least 30 faith points. Once you throw a hammer another 15 faith points will be subtracted from your faith points bar.
Harm: The reversed heal spell will cause damage based on the faith skill to enemies around the caster in a 3 meter radius.
Bless: Will increase the melee damage by a percentage (e.g. 150%) based on the faith skill of the caster.
Curse: The reversed Bless spell will cause enemies around the caster to decrease their attack damage by a percentage (e.g 50%). The spell's power depends on the faith skill of the caster.
Bravery: Will render every allied troop around the caster immune to fear effects.
Terror: Will attempt to make nearby enemy troops run away. Undead and constructs are immune to the effect. Resistance to fear is calculated using the victim's level, thus a higher level victim will be much harder to frighten than a lower one.
Heal: Heal is an AoE effect. It affects yourself and the others around you within a smallish radius. Just remember, when using spells like heal, flamestrike, and etc, you will wave your arms in the air to "cast". This will leave you open to an attack if you're not careful!
Turn Undead: Extremely powerful once a day cast. *it will be reduced in damage soon* Right now you can cast it and kill a ton of undead with it even at level 3-4 of faith. It's an AoE effect as well.
EDIT: Paladins also get Lay on Hands, a very powerful heal with some special parameters, but you said cleric so