To permanently disable a feature in the game. We can add the following line of code in the “skill_types.xml” file. This line will make that ability only usable in the world we select.

<req type="world">green</req>

EXAMPLE:

If we have our server in “red world” we will add “green world”.

In this way this ability will only be usable in a green world and our world, not being green, will not appear.
In my case I have disabled the interact ability. So that the missions of the npcs disappear forever.

COPY/PASTE:

<ability lvl="0" name="Interact" id="297">
    <duration const="">0</duration>
    <ability_skill_mult>0</ability_skill_mult>
    <entities/>
    <!-- entities are defined in quests_subjects.xml -->
    <requirements>
        <req type="world">green</req>
    </requirements>
    <results/>
</ability>

For questions about this tutorial contact Joseantime#1000 on discord.