This was one of the greatest pursuits of refinement path — combining all kinds of killer moves into one Gu worm!
For instance, mortal killer move self strength.
This move was a strength path killer move which Northern Plains Gu Immortal Su Xian Er had created for her daughter Hei Lou Lan. Its core was strength path, but it treaded on soul path and qi path, once it was activated, it could produce a human phantom, the phantom's appearance was lifelike and was a portrayal of the Gu Master's inner consciousness.
Moreover, this strength path phantom could act on its own and chase its enemies.
There were altogether fifty Gu worms used in forming this killer move.
According to Fang Yuan's current comprehension of the refinement path maxim: any killer move, be it of mortal or immortal level, could be considered as an incomplete recipe.