The Chaos Gene is a special gene that was created by Chaos to allow a Demigods, Nymphs or Mortals to achive Godhood through a metamorphosis like, process that come in stages like a butterfly each stage evolves the user body, spirit and mind going beyond their demigod limits until they reach the last stage.
(Phase One/Demi-God) Demigod with the Chaos Gene can surpass the limits of most demi-gods they grow stronger quickly, are able to adapt faster and their demi-god powers become easier to control. In order to reach the second stage, the user has to awaken there psyker once this happens their body will start to transform.
(Phase Two/Angel) Angels are transcendent demi-gods they have bodys comparable to that of Perpetuals they also gain new abilities and their souls become stronger. They are superior to normal Perpetuals because of their divinity. In order to reach the third stage, they have to absorb a C'tan shard and master their abilities.
(Phase Three/Pupa) In this phase the Angel will encase themselves in a cocoon for a certain amount of time. While in the cocoon their bodies and souls will transcend their hearts will start to pump ichor, and they will be able to claim their godly domains. When the process is done, they will reach the fourth stage.
(Phase Four/New God) In the New God phase they are similar to the Olympians and Titans but superior to both what makes them different is the amount of energy they have at their disposal in order to reach the fifth stage, they have to master domain.
(Phase Five/Celestial) At this stage they have surpassed the power of the Gods, Titans and Primordals they become a part of the universe itself making them cosmic entities their bodies will be made completing made out of cosmic energy and their souls become permanently tied to their domains.