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Case for lying:
- In previous editions, the contact being always had a chance of lying:
- In addition, the Commune spell explicitly says the being contacted will give truthful answers, whereas no such phrasing exists for Contact Other Plane.
Case for truthiness:
- From the spell the line "If a one-word answer would be misleading, the DM might instead offer a short phrase as an answer." This implies that maybe it can't mislead or lie to them.
- Game balance. Commune gives 3 always true one-word answers without chance of insanity, so it could make sense that CoP gives 5 true answers.
How would you run Contact Other Plane in your games?
I think this could strictly be up to the DM's digression. Personally I could see how contacting other planes (pretty much any time you talk to a fiend) would make thematic sense in the contacted being lying, either from mistrust or a grudge.
How would you run Contact Other Plane in your games?
I'd give truthful answers. The old chance for lying appears to have been superseded in 5e by the chance that casting the spell will drive the caster insane.
They can doubt it if they wish; they know the wording of the spell and the answer yo've given Experience will tell them over the course of the campaign how the spell works.
The only question is why you would want to, aside from being able to laugh at a player's costly mistake. And I get enough of that in 5 minutes of normal play.
Thanks for the opinions!