Prime Sentinels are higher-level Sentinels that lead their robotic brethren in their hunt for mutants. In addition to their superior strength, weaponry, and protective hulls, they learn from every encounter with an enemy, storing the data for future use and making it available to other Sentinels. Relentless and emotionless, they cannot be fooled by illusions and are not vulnerable to mental attacks. Driven by their programming, these mass-produced monstrosities lead the hunt for mutants and will only stop when they-or their prey- have been eradicated.