From HoNwiki

Runes of the Blight
Cost
90
Stats
None
Modifier
None
Location
Supplies
Dota Counterpart
Ancient Tango of Essifation

Lore

A favorite tool of the daemons, Runes of the Blight drain the life out of the ancient trees of Newerth to gradually restore the Health of those who invoke them. So helpful are these bleak runes that many among the Legion are known to carry them as well, despite being deemed anathema by learned Beast shamans.

On Use Effect

Allows the bearer to consume a tree, restoring 115 hit points over 16 seconds. This item stacks for each buy you get 3 of the item.

The More You Know

Trees grow back every 5 minutes.

This item can be shared with allied hero.