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Enemies have 2 to 4 weaknesses to Types. Dealing elemental damage that they are weak to will cause their Toughness gauge to reduce. When the enemy's Toughness gauge is fully depleted, they will suffer a Weakness Break, taking an instance of Break DMG, receiving a debuff corresponding to the element that caused the Weakness Break, and delaying their action. Such an enemy will stay in the Weakness Broken state until their next turn, during which they will take slightly increased DMG.
Player characters do not have Toughness, and are unable to be inflicted with Weakness Break. However, elemental debuffs can still be applied to characters by certain enemy attacks.