D20 Modern Mod is a total conversion system for Neverwinter Nights (NWN). This set of hak paks and a Toolset import modifies the entire game, replacing NWN's D&D 3.0 rules with Wizards of the Coast's D20 Modern ruleset, 2002 release. The system is in its fourth full release, and a new version is currently being developed. It is published on the New Vault.