Did not get Mecha Perfection Turbo rank4 from Hertz Locker Hard mode
Common ProblemsBeat Mechagon Hard mode Hertz Locker achievement but did not loot Mecha Perfection Turbo
In order to be eligible to loot the rank 4 Vision of Perfection essence, you must already own the rank 3 essence. Completing the hard mode achievement Hertz Locker before you have received rank 3 Vision of Perfection will not drop the 4th rank.
Once rank 3 is obtained, you should be able to visit Prince Erazmin in Rustbolt to obtain the Rank 4 essence without having to complete Hard Mode again.