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Page Updated:   2021-10-22

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As of December 1st, 2016, Roll20 has opened the ability for community members to build their own Compendiums for available OGL systems outside of D&D 5th Edition SRD and the Pathfinder SRD. A volunteership program is now available for potential members to volunteer to become a Compendium Editor. These new Compendiums will have all of the features of the original two Compendiums, including Character Sheet integration and drag and drop functionality. Editors will be working to help push content to our users and are expected to respect the rules of the site and the game they are working on - any violation or vandalism of the Compendium will result in removal from the project team.

Editors should have a firm grasp of the rule system they would like to prepare and ideally have some familiarity with HTML, wiki writing, and/or authoring Structured Data. Structured data is strongly suggested to begin a Compendium, however we will consider manual submissions if the data is not available.

At present, Roll20 will be limiting one Editor per game system Compendium. After an initial Compendium project is completed, an Editor may be considered to help contribute towards other future Compendiums in collaborative projects.

Building A Compendium Manually

If you have no existing online database to create JSON files from, you'll need to build the Compendium directly in Roll20.

Page Creation

Once selected by the Roll20 team as a Compendium Editor, you will be given access to a blank Compendium book to start editing and fill with content. During the process of creating the staging area for the book, you'll want to assemble a list of Categories needed for your game system (Rules, Monsters, Items, Spells, etc). You will want to have the organization structure straightened out before work on the Compendium begins.

Once you're given the URL for the new Compendium book by the Roll20 Team, you create new pages by tacking on the name of the new page at the end of the URL in the address bar and hitting Enter. (example: https://roll20.net/compendium/MyBook/Test Page) For special characters like spaces, parenthesis, and apostrophes, once you hit Enter, the page name will be adjusted to use HTML Code for the needed ASCII characters automatically.

Since the page does not yet exist, the Compendium will display a page that says:

Not Found: [page name]

We don't currently have a page that matches that name. Try again?

Or maybe you'd like to create this page?

Below this will be a drop down menu for the Category you wish to add the page to. If this is the very first page, you'll not have any available Category to choose from in the drop-down other than Miscellaneous to start with, so this is where you should start adding your own Categories.

Once you've set or added a Category to the page, click on the blue Create Page button to create it. This will drop you onto the newly created page to start editing it.

Editing a Page

Once created, a Compendium page will be split up into two distinct parts: A Text Editor and then an Attributes Table underneath.

Text Editor

The text editor can switch between a WYSIWYG and an HTML version by clicking on the </> button which is the last button on the right side of the text editor's toolbar. You may find that writing your Compendium entries in HTML may make Sheet integration easier as you won't get tripped over by unseen/unexpected formatting that can sometimes occur when working in the WYSIWYG version of the editor. The text editor is where you would include monster/class/race bios, feats, and abilities. Any data that can not be contained in a single input field should be placed here. Use heading tags (<h1>, <h2>, <h3>, Etc.) in a consistent manner to split your content up for efficient integration. It is incredibly important that text formatting is also kept consistent throughout the entirety of the Compendium book.

Dynamic Linking

You do not need to manually create page links within the text copy of your Compendium pages. Page linking is done automatically after Roll20 initiates a Compendium build. This automated process scans through the text contents of every single entry of the Compendium to match strings up with any available page titles. When a match is found (the page name and string must be identical save for Capitalization), the string is automatically hyperlinked to the matched page.

Creating Category List Pages

Once the individual entries of a Category are created, creating index pages (I.e. Monsters by Name, Equipment by Type, Spells by School, etc) are automatically generated by adding this search template in the Text Editor for the desired index page and saving it.

{{SearchIndex|***filter parameters***|}}

You can use multiple of the following filtering parameters all at once. Simple separate the filters apart with a space as you list them between the two vertical bars.

Category: Assigning the Category attribute will list all entries under the specified Category. The entries will be listed by their entry names in Alphanumerical order.

Example:

{{SearchIndex|Category:Monsters|}}

This will list every single entry that is under the "Monsters" category.

GroupBy: This filter is typically used alongside the Category filter to help sort the resulting list. This will assemble the entries into groups. An example from the D&D 5th Edition SRD is listing [Monsters by their Type] (aberration, goblinoid, ooze, etc) or [Challenge Rating]. Entries within a group will then be listed alphanumerically.

Example:

{{SearchIndex|Category:Monsters GroupBy:Type|}}

This will list the various Monster Types available and then sort the Monster entries via their "Type" Attribute.

Source: If there's a Compendium that is comprised of multiple books, a "Source" Attribute will likely be created to designate which book an entry page is being pulled from. This makes you able to create an index strictly listing content only from a designated source.

Example:

{{SearchIndex|Category:Monsters GroupBy:Type Source:Bestiary2|}}

This will generate a list of entries under the "Monsters" category, grouped by their "Type" attribute, and will only use entries listed with the "Source" Attribute "Bestiary2".

Attributes Table

Attributes Assigned to a Battleaxe Compendium Weapon Entry

Below the Text Editor is the Attributes Table. This area is to input traditional statblock content that is consistent throughout your Categories: Armor Class, Languages, Weaknesses, Immunities, HP, XP, Passive Perception, etc., for Monsters. Weight, Item Type, Armor Class, Stealth rating for Items. Damage Type, Weight, Properties, Damage Die for Weapons. Commonly these Attributes are already broken down into a table within your rule book to carry it over into your Compendium entries.

Adding Attributes

When you're starting off with a new page, there will be no Attributes assigned to it. To start adding Attriburtes, click on the Edit Attributes link to the right of the Attributes heading. This will not only reveal hidden Attributes (if there are any), but also add a new link at the bottom of the Attributes Table labeled + Add New Attribute.

A drop down menu labeled Choose an attribute... will appear on a new table row. If you have created Attributes previously on other entries, those Attributes will appear as options on this drop down menu. The first option on the menu is Create new attribute... and likely will be what you'll be using mostly until you have all of your desired Attributes created.

Creating a New Attribute

Once selected, an empty field will appear to the right of the drop down menu and a smaller field directly below the drop down menu with the temporary text ,"New Attr Name", within it. As you might expect, the "New Attr Name" field is for the name of the Attribute you wish to create. The blank field on the right is the value the current entry has for this new Attribute. In the example image above, the attribute being created keeps track of an entry's "Element". I am assigning the Element for this entry the value of "Fire". An Attribute's value can be numerical or it could be a string.

Continue adding Attributes as you need in this fashion, either creating them from scratch or choosing from the drop down menu. When you are done, scroll up to the Attributes heading and where the Edit Attributes link used to be. While in Edit Mode, this link's label will change to Save Attributes. Clicking on this not only saves your changes, but it also logs any newly created Attributes so they can be brought up again on a new page.

Editing or Deleting Attributes

You can't delete Attributes until they're saved down first. Once saved, you can click on the Edit Attributes link again to return to Edit Mode. Any previously added/created Attributes will have a pen and trash can icon appear on the right side of the Attribute row when you hover your mouse over any one of them. Clicking on the pen icon will open the Attribute up once more so it can be edited, while the trash can icon will delete the Attribute. Remember to click on Save Attributes to exit out of Edit Mode and save your changes.