This website use the great DnD fonts from /u/Solbera. The fonts were originally posted in this reddit thread, although I am using the fixed version available here in Github.
Both versions are available under the CC4 license.
Somme css, such as the ornate first letters, have been copied from or inspired from Homebrewery. This is a fantastic tool and I stongly recommend you to take a look at it if you don't know it yet.
The source code is available here, under MIT License.
This website runs on Grav CMS. A very light flat file CMS, under MIT License.