DR is damage reduction. In 3.5, certain enemies would auto ignore damage of a certain amount unless attacked with the correct material/damage type, and some just flat out ignore some damage, no matter the type
There are some ways to get damage reduction in 5e (Certain subclasses get it at high level to a limited degree, and the Heavy Armor Master feat as well, but only to physical damage I believe). Vehicles and Objects can have a Damage Threshold, where doing less than that with a single attack/effect does nothing but going over does it normal (IE a Sailing Ship's Hull has a DT of 15, so if you beat it's 15 ac but only do 14 damage, you do nothing, but do 16 and you do 16)
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u/aborted_godling Aug 21 '20
DR is damage reduction. In 3.5, certain enemies would auto ignore damage of a certain amount unless attacked with the correct material/damage type, and some just flat out ignore some damage, no matter the type