At first glance, it seems much weaker than other Advent bosses, having merely 1,000,000 health and a very big blind spot. That is until you realize its powerful gimmick and synergy with the enemies in its debut stage. First, its bigger piercing range and slow movement only prove annoyance with a guaranteed freeze posing a huge threat. Even with its much lower health, if it is killed by non-Zombie Killers, it can revive quickly and infinitely. What makes it all much worse is the fact that its debut stage includes two of them, making the stage arguably one of the hardest Advent Stages.