>>542065010
>>542065173
This is all you need. It's available to everybody by default. When it's active enemies who reach 0HP by your melee blow don't die but receive the "Unconscious" condition instead. Beware that they can still be killed by other sources (like ongoing AoE spells or DoT damage effects from poison), so examine the body before leaving the area to make sure it doesn't say "Dead".