From Liquipedia Dota 2 Wiki
Silences an enemy unit and deals damage at the end of the duration. The damage dealt is a percentage of all the damage the target had taken during the silence duration.
Orchid Malevolence is useful in four, often overlapping, situations:
- Heroes with no disable that rely on the silence to ensure their target cannot escape. They will generally have the movement speed to chase their target down.
- Heroes that benefit from the increased mana regeneration and intelligence.
- Heroes that gain a noticeable damage output due to the increased attack speed.
- Heroes that want to provide a silence to their team to shut down key enemy heroes.