copying and pasting it from my reddit post.
Don’t invest in spear bleed builds as of now the tooltip on spear mastery doesn’t do what it’s supposed to do “Critical Hits extend the duration of your spear debuffs and damage over time effects by 20%.” When comboed with “Skewer” it increases the duration of skewer to a cap of 20 seconds this mastery only applies to skewer, this mastery does NOT work for bleeds applied by the spear like it says in the tooltip when it comes to “Coup de Grace” weapon perk which i have tested and I’m assuming “Keenly Jagged” also doesn’t work which both can be applied via spear.