The book of talismans was Lu Changsheng's gift to Mu Fusheng upon becoming his disciple.
Basically, all of Mu Fusheng's talisman seal techniques were learned from the book of talismans. Day after day, year after year, Mu Fusheng never stopped studying the book of talismans.
To this day, Mu Fusheng has not fully comprehended it.
Not only does it contain the methods for inscribing various powerful talismans, but it also includes techniques for inscribing talismans that are unheard of.
Mu Fusheng has encountered other talisman masters, but they all acted as if they've never heard of the inscription techniques in the book of talismans.
The Gathering Talisman Technique is one of them.
However, the casting time of the Gathering Talisman Technique depends on the Spiritual Strength of the caster and how many talismans and the Talisman Level are needed to be concentrated.
It can be said to be quite long.
