It could be said that Shang Xia somewhat had experience creating talismans like that. 

When he successfully comprehended his Chaos Essence Lightning Palm, he created several Lightning Charms with the use of Lightning Wood Boards. Those lightning charms could be considered rank one talismans, and even though the power contained in each couldn’t match up to the Chaos Essence Lightning Palm if he executed the technique personally, it was impressive nonetheless. If he managed to catch Martial Extremity Realm cultivators off guard, he would be able to seriously injure them!

…

After taking a break, he managed to complete the other half of the talisman. 

He might have created a new type of rank two talisman, but his instincts told him that it would definitely be several times stronger than any of the rank two talismans he made previously.

Successfully creating...