EXDEFS

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EXDEFS is a WAD lump introduced in Heretic + Hexen. It is used both in Heretic: Faith Renewed and Hexen: Vestiges of Grandeur to enable the changes seen in these mapsets, such as new weapons and enemies, as well as to offer the optional gameplay update and rebalance offered in Heretic and Hexen.

It is a JSON derived format, allowing interchangeable editing. It is not a part of the earlier ID24 specification. In practice, it defines or re-defines actors, items (including weapons, artifacts, and pickups), player classes, states, and sounds, serving as the remaster's content definition language.

For Heretic: Faith Renewed and Hexen: Vestiges of Grandeur, these lumps were manually written by Xaser Acheron.