This video is kinda misleading in a way that we can't possibly kill all cumans because some of them are out of bound, and some of them only show up in cutscene. However, I will be killing every cuman I can reach at the begining.
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Stat Guide from ‪@marilala2274‬   • Max Stats in Skalitz - Is it possible...  

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0:00 - Intro
0:30 - Time in Skalitz
3:46 - Cuman Unaliving Spree