https://www.pathofexile.com/forum/view-thread/2331235Skill Reveals - Soulrend and Bane
Bane is a new skill that instantly applies a damage over time effect in a large area. It also applies your linked curses to enemies, up to your curse limit. The damage over time deals more damage for each curse Bane applies (up to 47% more damage at level 20 of the gem). The effect has 50% increased duration for each curse Bane applies.
Bane has the Curse skill type, letting some modifiers on the passive tree like Skill Effect Duration of Curse Skills, Area of Effect of Curse Skills, and Cast Speed of Curse Skills apply to casting Bane. These passive tree stats have been updated to match this behaviour.
only seeing a 0-linked Bane in this video, only ''linked'' to curses