Fengwen is a record of things, which is usually used in Zhenfeng.

in some special cases, it will take several years or decades for the evil spirits under Zhenfeng talisman to kill them. For such a long time, it is impossible for the caster to be around all the time, so the first caster will write an envelope on which all the information about the suppressed evil spirits will be recorded, so that later people can know The cause and effect of things can be adjusted at any time to deal with the strategy of evil spirits.

at this time, the seal found from the bottom of the burial dragon...