# Does the 4e Feat Diabolic Soul only replace Infernal Wrath after receiving a critical hit?

The way I currently understand it, the feat appears to imply that the transformation power replaces infernal wrath only after receiving a critical hit. Am I correct in this? The relevant piece of the description is below.

Whenever you take a critical hit, you gain a +2 feat bonus to attack rolls against that enemy until the end of the encounter. In addition, you replace infernal wrath with diabolic transformation.

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