As of version 3.16.0, the passive skill is located at the top of the tree, aka Witch area. The cluster shares the same connection small passive node with Heart of Darkness Notable.
The Corruption cluster has moved to where Whispers of Doom used to be. It now has 6 passives, with the original passives making up the entry and left path. The notable now grants 0.2% of Chaos damage leeched as Energy Shield. The right path grants 4% Chaos Resistance penetration on each passive.
Among the loot dropped by the Blight, you'll find Oils, a new type of item. With three oils, Cassia can Anoint your amulet with one of the Notable Passives from the Passive Skill Tree, opening up incredibly powerful new build possibilities!
(not in patch note) The increased Chaos Damage has changed back to 15% (up from 10%).
The increased Damage over Time has changed to 15% (up from 10%)
The Non-Ailment Chaos Damage over Time Multiplier has changed to 10% (up from 8%) and now became Chaos Damage over Time Multiplier
The Corruption wheel (north of the Witch) now also grants a total of +11% to Non-Ailment Chaos Damage over Time Multiplier. The Corruption notable now grants 10% increased Damage over Time (down from 15%) and 10% increased Chaos Damage (down from 15%).