The Power Core instance is undoubtedly and by far the most difficult of the three Fortress of Solitude raids. Despite the combat rating requirement of 50/53, it is practically impossible to complete this raid without much higher stats. A full team of players with at least 65 CR is recommended, and a couple of tier 5 (CR 84+) players would help greatly. To avoid casualities along the path, tanks must draw several mobs to themselves at a time and avoid being swarmed by the whole crowd at once at all costs.