This article's content is accurate to the most recent public game version, 0.4.8d.
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Death Breath is a skill that deals strong 
Instant Death element damage to all enemies. If any enemies are afflicted with the 
Weakened status effect and not using Guard, they will instead suffer lethal damage.
The only skill capable of applying the Weakened effect is Enfeebling Mists, which along with this skill are signature abilities belonging solely to Life Drinker.
The following enemy can cast Death Breath: