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What platform are you running Path of Building on?
Linux - Wine
What is the value from the calculation in-game?
It is a mark so enemy counts as marked for stuff like mark the prey and marked for death
What is the value from the calculation in Path of Building?
In PoB the nodes do nothing as PoB thinks enemy is not marked
How to reproduce the issue
Grab Penance Mark from Hateful Accuser and click Marked for Death, see no Culling Dps
PoB for PoE1 build code
https://pobb.in/u/thedeathbeam%237125/deadeye-kboc-meme - Using Alch mark as workaround there, just unlick it
new link for above pob as i forgot i deleted it:
https://pobb.in/L7HRWZcNtOGN
Screenshots

Check version
Check for duplicates
Check for support
What platform are you running Path of Building on?
Linux - Wine
What is the value from the calculation in-game?
It is a mark so enemy counts as marked for stuff like mark the prey and marked for death
What is the value from the calculation in Path of Building?
In PoB the nodes do nothing as PoB thinks enemy is not marked
How to reproduce the issue
Grab Penance Mark from Hateful Accuser and click Marked for Death, see no Culling Dps
PoB for PoE1 build code
new link for above pob as i forgot i deleted it:
Screenshots