One of the limitations of Commune With Nature is that
The spell doesn’t function where nature has been replaced by construction, such as in dungeons and towns.
I am uncertain what that entails given that one of the subjects one can divine is buildings.
The D&D 5e spell Commune is a Cleric spell that contacts the Cleric’s chosen divine proxy and asks them three ‘yes or no’ questions. It is a ritual spell, so a Warlock with Book of Shadows or anyone with the Ritual Caster feat really can learn and cast the spell.
Let’s say an atheist wizard uses the Ritual Caster feat to learn Commune (gaining Ritual Caster does not require belief in any pantheon) and then casts it (which can be done through an arcane focus). Who would she encounter? (If it helps, the Wizard belongs to the School of Divination.)
What happens if a PC asks the Commune spell a paradox?
Would the answer to my question be no?
Actually, if the answer is no, then it is no, so the real answer would be yes, but again, yes is not the expected outcome and so the answer would be no again.. and so on.
(this is similar to the Orc paradox).