Legends of the 3rd Age (formerly: Blue Wizard Mod) adds two new playable factions, Lothlorien and Moria, to The Battle for Middle-earth(tm). These factions come with a fully functional AI. It also enhances the original factions with additions and changes the gameplay. The focus here is clearly on multiplayer. Units and structures are designed to fit in the original game's style.
The Numenorean Craftwork spell has been replaced by a spell called "Man the Towers", which enables level 3 black smiths and farms to shoot arrows. The spell's functionality is still subject to change.
No other spell was changed. For the full explanation, see here: Moddb.com