Btw lucera can sell buffs with coins/items just go gameserver/data/buffs_tempaltes.xml create your buff template, take my example.
<template menuId="99973" target="BUFF_PLAYER">
<consume>
<item id="9143" amount="10" />
</consume>
<produce>
<skill id="308" level="1" />
</produce>
</template>
if you want to create something like buff coin ( item to not get removed )
just make the amount "0" and you just need the item in your inventory.
<template menuId="99973" target="BUFF_PLAYER">
<consume>
<item id="9143" amount="0" />
</consume>
<produce>
<skill id="308" level="1" />
</produce>
</template>
html bypass
bypass -h scripts_services.Buffer:act ask=99973&reply=npc-40010
Or you can edit server.jar script.jar with this guide!
Also you can save the classes if you want to get updates and replace it again.