 The 4e playtest artificer was updated quite a bit for his first official appearance in the "Eberron Player's Guide", with the biggest change being to his healing infusions, which was intended to help differentiate him from other leader classes.A design & development article in "Dragon #376" (June 2009) provides interesting insights into the development of the artificer [...], such as the fact that special rules only used by the artificer [...] were replaced by more standard 4e mechanics [...] because the new rules 'didn’t amount to enough mechanical benefit'".Artificers are arcane leaders.