How to change or add Books buffs

[Optimus]

tell me what files must be edited in the client and server here is how to video !?what filesI need to change in the client and server?
I would be very grateful for the help
https://youtu.be/_teL4H4hMD0

[MentaL]

[GODSKIN]

u need Show ?
not need help ?
very easy for creat it new buff + efx

** efx name in vdo
LAKE_D_Elimental_n_main.efx
LAKE_D_Elimental_s_main.efx

don't sure

[Optimus]

and can describe in detail ?the help I needbut I want to doas directed(instructions) to do it myself)I just don't know what files to modify