Druid pouch

The Druid pouch is an item first obtained during the Nature Spirit quest. Its main use is to protect the player against the Ghasts that haunt the Mort Myre Swamp. To use it, you must first fill it with nature items obtained by casting Bloom by, (a) either with the item you're given during the quest or (b) with a Silver sickle near fallen logs, branches, or dead bushes and picking what grows.

Once the pouch has been filled, it can be used against the Ghasts. When one attacks, the pouch will automatically activate, making the monster visible. It can then be attacked and killed. It also protects any food you have in your inventory from becoming rotten.