enjoyable books.
the bells in some cases directly affect the spirit rather than the body. probably a dex and/or concentration check to wield them properly. they also affect both living and dead, not just the dead.
ranna can bring sleep or quiescence, will affect the ringer if not careful. deep slumber / sleep effect.
mosrael wakes the dead, so likely functions as a summon.
kibeth walks the victim or the wielder. fort save i would guess. control body power (psionics) would be a good fit.
dyrim, speak with dead, as you say. as for the silence part, just use a self only silence, but longer lasting.
belgaer, probably use the remove memory and something like legend lore to recall or know something. maybe limit it to what one has actually experienced.
saraneth, sounds like the cleric ability of control/rebuke/turn undead with a little bit of geas in there. simply reverse the effects if you epic fail, or just brain lock (again, psionics) them if the minor fail.
astarael, can be resisted if far enough away. otherwise a combined slay living and that sever the tie (?) spell / stygian disruption power so that it pulls down the dead too.
borrow (and alter) some stuff from the ghostwalk campaign setting too.