I think that instead of Clemency (GCD) or Equilibrium (long CD), DRK was supposed to passively gain HP just using their DPS combo (Souleater). So whereas a PLD or WAR needs to actively use the skill and is limited by CD or MP (or GCD), DRK gains HP over the course of the battle for free. Also, DRK has Abyssal Drain. Just saying, DRK has multiple ways to self heal other than Sole Survivor.


In my opinion, the effect should be changed to be that if the enemy is under 20% HP, it instantly grants you the effect, rather than it having to be on when the enemy dies.