Middle-earth Extended Edition is a project with the goal of expanding the game with new units, heroes, spells and factions as well as adding unused features existing in the game and bringing more realism to its combat system.
For the full list of changes related to Grima Wormtongue, please read the Isengard Update news article in the 'Articles' section.
Credit goes to Mathijs and the former Shadow and Flame mod team.