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There is a Christ cross item on one of the shelves in the storage room past Phonty that can neutralize Konstantine for 30 seconds and stops him from moving and driving you insane. Hold the cross out and touch him directly for the cross to work. You'll know it works when you hear a low quiet "THUN" sound effect after touching Konstantine with the cross (The cross won't work when you meet Konstantine for the first time in a single run, standing upright; you have to get him to move by turning yourself around or backing away from him upon seeing him and wait for him to start moving for the first time before you can face him again for the cross to take effect.) The cross only works for 30 seconds each time you touch Konstantine with it, so be cautious of your surroundings and timing before you enter a classroom to solve a notebook. If you get chomped by Konstantine only a few times, immediately take out the cross and slowly walk away from him after he's been frozen in place. Do not run or you'll lose blood much faster. You may lose more than half your blood, but your blood will slowly stop spilling if your health remains undisturbed for about half a minute, then it will take about one minute for the blood bar to replentish and be fully restored.