The passive skill Shadow Smash (494923) is supposed to extend the Poison Shroud debuff during by 4 seconds according to:
EN - Extends your [494961|Poison Shroud] effect by 4 seconds and inflicts dark damage to targets within a range of 70.
In fact, the debuff Poison Shroud (623128) caused by Poison Shroud (499569) has a duration of 12 seconds, but that is already the inital duration of that skill without Shadow Smash (494923).
Please change it like Shadow Smash (494923) does extend the duration by 4 seconds.