Prior to the latest hotfix (34.0.5), Voruna's attacks with Ulfrun's Descent active, only temporarily broke Shroud of Dynar's invisibility before putting her back into her invisible state without triggering the melee buffs. Now, leaping onto a target will cause the invisibility to break and trigger the Shroud of Dynar's melee buff with Voruna still in her Ulfrun's descent, forcing her to cast her invisibility every time she'd leap onto a new target to take advantage of the ability synergy with her 4th.
Behavior prior to the hotfix:
Behavior after the hotfix: