This article will guide you how to make a simple XML mod that changes the amount of health that Medkits restore. This guide implies that you use VS Code and shows you a way to search for things in game files.

1. Create an empty mod
2. Install Visual Studio Code as specified in the article linked above

1. Open ChairManager/PreyFiles in VS Code. This folder contains all XML files that you can mod.
2. Press Ctrl+Shift+F to open Search All Files.
3. Type medkit. This will show a large number of results.
4. Press "View as Tree" and "Collapse All" buttons at the top to make it easier to navigate.
5. Entities (e.g. interactive objects) are defined in Libs/EntityArchetypes. Open the first search result in Libs/EntityArchetypes/ArkPickups.xml.

    <EntityPrototype
        Name="Medical.MedKit"
        Id="{58D44466-33E6-491B-B0F1-9FE4B0FAE192}"
        Library="ArkPickups"
        Class="ArkMedKit"
        Description=""
        ArchetypeId="10739735956144611826">
        <Properties
            metaTags_ArkMetaTags="3149325216955299302"
            bAvailableForRandom="1"
       ...

6. The game uses signals to apply effects like damage or healing. Navigate to AppliedOnConsume element.

            <AppliedOnConsume
                es_RestoredPoints="HEALTH"
                signalpackage_SignalPackage="7745561655334079461">
                <OptionalAbilityRequirement
                    ability_AbilityRequirement="3149325216929346739"
                    signalpackage_AbilityRequirementSignalPackage="10641886185836882035" />
            </AppliedOnConsume>

7. This element states that when a medkit is comsumed, signal package with ID 7745561655334079461 is sent to the player.
   Signal package is a combination of signals and their values sent at once.
8. Press Ctrl+Shift+F and search for 7745561655334079461.
9. Open the result in Ark/SignalSystem/Packages.xml.

    <package
        name="MedKit"
        id="7745561655334079461">
        <signal
            signalID="7745561656291547932"
            value="300" />

10. It states that this package will create a signal with ID 7745561656291547932 and value 300 (30 health points).

• You can search all files for 7745561656291547932. Open the result in Ark/SignalSystem/Signals.xml to find out what that signal actually is.

12. You will need to change the value 300 to a different one.

1. Open your mod folder in VS Code. Create a folder named Data.
   
2. Create the folders Ark/SignalSystem and create an empty file named Packages.xml
   
3. Copy and paste the root objects from the original file. Don't forget to close the <packages> tag.
   
4. Copy and paste the element for package with ID 7745561655334079461
   
5. Change the value to something else. In this case, 10 (1 hp).
   
6. Save the file by pressing Ctrl+S

1. Apply the changes in the game:
   • Preditor: Restart Predtior. It will merge the files automatically.
   • Game: Press "Merge Mods" in ChairManager
2. Try it out. Launch Preditor/Game
3. In Debug Menu at the top, press Campaign -> Clean Load Level -> Lobby
4. Jump down to take damage
5. Spawn a medkit: Debug Menu -> Items ->Give Item: -> MedKit
6. Use the medkit and check how much health was restored
   • Alternatively, check the description of the Medkit item

You now have a basic understanding of how XML mods work, how to look for things to change and how to make an XML mod.