From Dota 2 Wiki
| Infused Raindrop|
|Elemental protection from magical assaults.|
- Starts with 3 in stock.
- After that, it has a 1 minute restock time.
- Maximum of 3 in stock at all times.
- Infused Raindrops do not stack in the inventory. Each of them requires its own slot. Their regeneration does stack. They lose charges at the same time, although only one of them actually blocks damage.