Minecraft wiki entry for Effect, associated text: Damage dealt by effects (a kind of "magical damage") completely bypasses armor, making it a good way to deal with highly-armored targets (Protection enchantments reduce damage taken from effects in Java Edition only). Witches are the only mob to have natural protection against effects, taking 85% less‌[Java Edition only] or 95% less‌[Bedrock Edition only] damage from effects, except Wither.