This length of Thunder Tribulation Vine is quite special, capable of elevating his Divine Technique, Purple Sky Divine Thunder. If he refines this Thunder Tribulation Vine, perhaps Gu Yuan's Purple Sky Divine Thunder Technique might truly elevate to a Prototype of Great Divine Techniques.
However, there's a problem with this.
The Purple Sky Divine Thunder Technique was gained through taming the Purple Sky Thunder Spider, and not cultivated by himself. Although Gu Yuan could wield it with ease, it still lacked a certain down-to-earth authenticity compared to the Sword Skill Divine Techniques he painstakingly cultivated.
If he uses this technique as his future foundation, it's evidently not quite suitable.
