If the file isn't encrypted, and you can read lines, you can use gemini decompiler.
You can reference my old site to get the tools.
http://basicpiratesserverinfo.weebly.com/
47 Invincible Potion -1 0 State_PKWd_Add State_PKWd_Rem 1 0 1 1 1 1 1 0 0 0 1 1 1 1 0 0 0 -1 0 0 0 0 -1 0 0 0 0 0 0 0
If you want to make it show a glowing affect, when player uses the item until time runs out.
I will provide to you a random effect you can change to whatever you want.
416 -- Devil Tower glow (Purple) , when players use the potion it will display this glow effect.
47 Invincible Potion -1 0 State_PKWd_Add State_PKWd_Rem 1 0 1 1 1 1 1 0 0 0 1 1 1 1 0 0 0 -1 0 0 0 416 1 0 0 0 0 0 0 0