In the upcoming module, there will be a change to the way the helmet Minos Legens functions:
The pseudo-Toughness feat the helmet grants will grant 20 additional hit points to the wearer (that stack with all other sources of extra hit points) regardless of character level, and will no longer grant unintended access to enhancements that require the Toughness feat as a prerequisite.
It is possible that characters that possess Toughness related enhancements solely due to the feat granted by Minos Legens may have their enhancements respecced when they log in after Module 9 goes live.
If you do not wish to risk this due to wishing to keep your current enhancement layout, I highly recommend acquiring the Toughness feat before then.