Stamina is a mechanic in Dark Souls.If you run out of stamina,you can't do some stuff like using weapons,blocking,sprinting,and jumping.What uses stamina is attacking a weapon,blocking a attack (10 stamina used per block),and jumping (5 stamina used per jump).When attacking with a weapon,it's speed determines how much stamina is used in a attack (Insanely Fast costs 3 stamina per swing/shot,Very fast costs 7 per swing/shot,fast costs 11 per swing/shot,Average costs 17 per swing/shot,Slow costs 21 per swing/shot,Extremely Slow costs 30 per swing/shot,and Snail costs 40 per swing/shot.). The only items that do not cost stamina are guns (Ammo for guns costs 10 times more than usual) and magic weapons (Magic weapons use mana).