From Liquipedia Dota 2 Wiki
Protects the user from harm. Passively blocks a single target spell once every few seconds.
Temporarily removes Spellblock from the item's owner and transfers it to an allied unit.
- Multiple Spellblocks will stack.
- Enemies can see the Spellblock visual if it is cast on a unit.
- If a spell is successfully blocked on an ally during the duration, Spellblock is put on cooldown again.
- Cannot be cast on yourself.
- Cannot be refreshed by Rearm.
- Linken's Sphere is named after Link, the protagonist of The Legend of Zelda series.
- The name is derived from the World of Warcraft parody of Link, a character named Linken.