From Liquipedia Dota 2 Wiki
Diffusal Blade can be upgraded once by buying the recipe again. The item starts with 8 charges, and the charges are refreshed to 8 when it is upgraded.
Purges a target unit, removing buffs and slowing it. The unit gradually recovers speed over time. Non-hero units will be stopped for the first few seconds and slowed for the last second.
Your attacks burn mana and deal part of the amount as damage. Feedback does not stack with other sources of mana burn. Illusions burn a reduced amount.
This item is particularly useful on heroes that can create illusions.
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