I would recommend to replace it with Deadly Shot (or Mortal Shot, or Slaying Shot), which would behave much like Death Blow:
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You aim for the target's vital organs to fire a deadly shot, attempting to slay your enemy. This powerful shot will deliver %d%% damage, granting an automatic critical hit. If the target ends up with low enough life it might be instantly killed. At level 4 it drains all remaining stamina and uses it to increase the shot damage.