You describe a situation in as much detail and with as many facts you know. You then describe a general conclusion/Answer you want to deduce from that situation. All the brains thinking potential is used up in one burst of reasoning which destroys it. The GM offers a truthful reply of the best conclusion that could be derived from the described facts. If the described situation is too vague or there are too many contradicting pieces of information, the DM responds that a meaningful conclusion is impossible.
The spell doesn't take into account any possible circumstances that might change the conclusion, such as wrongly observed facts
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can replace the brain needed with that of a lower intelligence.
* - (One brain of high intelligence which has been dead for no more than five hours which the spell consumes)
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