Thank you for the screenshot! So that's a bug on my game... :/I'm 100% positive I didn't take any Perk from the Cold blood tree and in fact you know what, since it's free, I took a screenshot:
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That made me realize that I though I was at 5 but I'm at 4. Either way, that Skill levels up and I never invested any point in it.
In fact, I didn't even took any Perk from Cool since a very long time. Only recently I added a couple points into it to pick up Hidden dragon (which feature a Spider on the icon of course lol) but Cold blood were already at 3 when I did and then it kept increasing.
It could be a patch that caused that but apparently, my game isn't affected somehow because that character I'm playing, he's kicking since Day 1 (I'm what you could call an extremely slow player, haven't finished the game even once lol) and as you can tell, I keep building up Cold blood (I'm not even caped at 4, the Xp bar is still filling up).
I though it was normal and to be fair, maybe it is and you encounter some sort of bugs with your game (that would be a pretty big one in fact). It would be interesting to hear from other players see how it goes with them.
But I am not the only one. Youtubers playing on good PCs too.
This is even written in Fextralife wiki that the first perk is a requirement to level XP in this skill...
In some sites, they say you need to realize finishing moves with melee weapons, with a strong attack. Did you experienced those finishing moves?
I don't remember for myself, I used baseball bat and hammer during several hours, it should have happened in my game...