I'm not sure if this is intentional, but there are no situations where Venator's execution effect activates.
Based on my testing, it appears that when an attack hits, the game checks whether HP is below 8% before damage calculation occurs, rather than after damage calculation. Therefore, under this calculation method, situations where execution activates either do not exist or are extremely rare.
Based on my testing, it appears that when an attack hits, the game checks whether HP is below 8% before damage calculation occurs, rather than after damage calculation. Therefore, under this calculation method, situations where execution activates either do not exist or are extremely rare.