All-Knowing Commoner

Training. The commoner has proficiency in one skill of the DM’s choice and has Advantage whenever it makes an ability check using that skill.

Omniscience. The commoner sees and knows all that occurs, has occured or will ever occur. It is impossible to trick, attack, decieve or out-manouever. It can preempt all attacks, engagements or events years in advance. 

Prescient Avoidance. As allluded to above, the commoner preempts and avoids any attack. 

Club. Melee Attack Roll: +2, reach 5 ft. Hit: 2 (1d4) Bludgeoning damage.

Momento Mori. The All-knowing commoner speaks directly at a creature - telling them exactly when, where and how they are going to die - Attack Roll: +25 to hit, reach 300ft, Hit: The target takes (1d100) psychic damage and is knocked prone, and frightened of the commoner for the next 3 rounds. 

Mental Deconstruction. The All-knowing commoner declares to the world the worst, most horrible, nightmarish moment of your entire life. - Attack Roll: Always Hits. reach 300ft, Hit: The target is terrified and temporarily insane, frightened of everyone for the next 3 rounds.