Ch 65: End of Revenge and a Royal Invitation
Moon Knights were known to be one of the strongest when it came to guarding and protection. They didn't have very high strength or agility stat but they had very high defence and HP stat. They were familiars of a high god for a reason.
Damage sharing was a primary ability for them and for that reason while fighting they try to take as little damage as possible and even use their limited healing skills to heal even minimum damages.
That was the same for the Moon Knight Dic summoned. When he started sharing the damage he actually had a full health bar. From what Elena calculated, if everything went as it was going on now, the moon night works lose about 47% of its max HP and Dic would remain completely unharmed after the attack ends.
Where on the other hand, Lux used up almost everything he had to launch this final attack and he would be on the verge of death after this. So, basically Lux would fail to avenge his fiancee and would also die by his enemy hand.