The problem isn't when the horse says the count did it because, you are absolutely right, the horse is simply another actor in the ongoing story.
However, when I hit the Divination button, because I'm a 7th level cleric, and my GOD tells me that the Count did it, that's a bit stronger. Or various mind reading spells. Or, Zone of Truth and simply ask everyone. Or or or.
There's a million and one different plot asploding spells out there. Speak with animals is a pretty minor one. Commune is a tad stronger.
If you have a chance, watch the second episode of
Medium. It deals directly with the question "Yes, I understand that you
know....but are you
sure?"
Yes, those things make it easy for the PCs to know the truth. For them to
prove what they know? That's a different kettle of fish.
Ex. Bob the Devotee of Asmodeus pretends to be a cleric of the One True Faith, then, after chanting and praying, says the Count did it. Did the Count do it? Do you know?
A cleric's god might not be wearing blinders (like the horse), but the Court isn't being asked to take the god's word; it is being asked to take the cleric's.
Zone of Truth is powerful, but it is possible to lie in the Zone. Is it possible to be Cursed to always lie in a Zone of Truth? When the Count claims that the PC caster made him somehow lie, and is trying to frame him, is that beyond what magic can do? Does the King know? Does the Court know?
Using magic raises as many problems as it resolves, unless that magic is used to help in the grunt work of finding actual evidence. And even then.......There's an Astro City story where a mobster gets off because, hey, he has enemies, and can the court
prove that a shapeshifting alien or rival supervillian wasn't setting him up? If the defense works for the good guys, it should work for the bad guys as well.
But, as far as DM's dictating the cleric's spells, doesn't that cut both ways? If the DM knows that they are heading into a murder mystery situation, shouldn't he tailor the cleric's list to be the most useful?
Yes!
Isn't that actually worse than letting the player pick his spell list?
No!
Because those spells only tell the PCs what they should be looking for. They know the Count did it, now how do they convince everyone else that the Count did it?
Your point depends on the view of the society in question. If magic is not trusted, then the testimony is going to be a bad idea at best; if talking to animals is a known quantity (and maybe even has precedent in the legal system) then procedures are in place and it's just another form of testimony.
Nah. It just presumes that the society has no way to say "Treat PCs different than NPCs".
IF "a horse told me" works for the PCs, THEN it also works for their enemies.
IF their enemies cannot just say "My god told me the PCs are guilty", THEN neither can the PCs simply say "My god told me that the Count is guilty."
Knowing that Dracula is a vampire changes where Van Helsing stands, but unless Van Helsing can convince Victorian London that Dracula is a vampire, it is not a "I Win" button. A lot of novel happens after Van Helsing is convinced.
In the same light, DNA evidence doesn't always result in a conviction.
RC