Sickle is a weapon to kill death, but it's really easier to use a cross. Sickle can attack small monsters, but it can't hit big monsters, just like hitting a three-headed snake with a cross, and then end the skill. Cross Power Attack (the fourth line of the skill tree) is super pervert. The sickle cuts that into a circle on the L+ cube, so (if there is no blood, you will defend yourself, and then they will cut you into a circle) the rest is useless.