Iron Heroes

Iron Heroes (previously also known as Monte Cook Presents: Iron Heroes; originally announced as Iron Lore) is a variant Player's Handbook for the d20 System of role-playing games, in the tradition of Arcana Unearthed. It incorporates the core d20 mechanic, while introducing new rules options, differently-balanced classes, an entirely new feat system, and changes to the way skills and feats operate. It is intended to allow players to take on traditional challenges at the same levels that their D&D counterparts would be able to, without recourse to magic items or high spellcasting. It was written by Mike Mearls, is currently owned and updated by Adam Windsor, and published by Fiery Dragon Productions.

Feat changes

Iron Heroes implements a novel "feat mastery" system, with the inclusion of more advanced feats that build off the core ability. Each class is given access to different feat masteries to a greater or lesser extent; an archer will have greater access to masteries related to ranged combat, while a berserker will have greater access to masteries related to melee weapons that take advantage of a character's great strength. Characters gain access to more advanced masteries as they increase in level and gain new feats. The core feats from the d20 system are also included, and can be taken by any character that meets the requirements.