To Di Tian, the new derived sub-ability, Node Avatar, was crazily overpowered.
Technically, they were supposed to formed after he passed each of the nine marked nodes of the 'Sun Zone'. But with the Heretic Emperor's discarnate soul trying to possess him at the exact moment his first was about to be formed, a mutation occured.
What the Grand Primordial Helix did was that it destroyed every bit of awareness in the foreign soul and merged it to form Di Tian's first Mind Avatar.
The unique thing about it was that it was equivalent to a Blank Consciousness with all of the Heretic Emperor's Battle IQ, comprehension ability and combat style. Di Tian could delegate it tasks like learning cultivation techniques on his behalf and absorbing its comprehension at any point.