Some effects may alter this amount. These effects will refer to the amount of damage needed to kill a unit. Example: Elder Dragon’s passive ability reads “Any amount of your damage is enough to kill enemy units.” This alters the Lethal Damage value for enemy units that have damage marked by you.
§ 142.4.c Core Rules PDF (officieel)
§ 142 Damage is a marked value that is applied to Units.
§ 142.4 Damage tracks how close a Unit is to being Killed. See rule 428. Kill for more information.
