Pirates Space

Upon this revelation, David was stunned and then immediately annoyed by the fact that he couldn't use the same gene path he used for the Vampire gene for the Werewolf gene. But when he thought deeply about it, he then understood. 

Bothe the Vampire gene and the Werewolf gene are natural enemies. The fact that he managed to practise the two legacy technique was mainly due to luck. The acquisition of the Unity technique was the luck part as without it, he would never have been able to practise the Teo legacy technique together. But it seems the limit for the Unity technique had been reached and could only be used until the Hexa-gene phase. As for the atman stage, the level of the technique wasn't high enough for his current realm.

  Which simply means that he would either have to find a higher level technique similar to the unity technique or take his time, creating another gene path different from the route of the Vampire gene in his body.