@josh headshots do double or more damage, the jura bless you ect will add to your rage counter, once you get 7 head/limb/torso/critical hits you go beserk which is a critical hit every time basically. leech is a percentage thing, level 1 leech has a 2.5% chance, 2 is 5% and 3 is 10% Auto-reload is for shotguns, means when your not shooting it reloads,(this is for manually shooting guns), that extra 5 gold a round can be a lifesaver.
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