But this an area effect item. Can be thrown away one area? Or should be thrown in the same area the hero currently is, harming it himself?
You can throw it like any other object to a given distance (as many areas away as the number of successes you get on the dice), and then it explodes in the designated area. Of course you could also send it at your own feet if you are surrounded by ennemies, just make sure you can dodge or suffer the damages better than your foes