While this article shows things from the core, or unexpanded Titan Quest game, but it did have one expansion in Immortal Throne (put out in 2007). Earlier this year, in 2008, Iron Lore closed it doors but thousands are still playing the game booth offline and online. The popular role playing Titan Quest game was distributed by THQ and it was developed in 2006 by Iron Lore Entertainment. The game brings you inside the grandness of Rome and medieval times and puts it on a Diablo 2 platform. All the controls are precisely like the Diablo 2 controls so those familiar with that game will be very used to how the game moves and feels.
Earth Mastery in the game is where you will rain down the natural effects of stone and fire, in a grand maelstrom of attack. It is needing tons of intelligence so that your attacks will have the effect that you are going to want. Core Dweller is going to be the one skill that you will always need a point in so that you can get a summoned being there to fight with you. Two is always a better number in battle than one.
Earth Mastery has many stone and fire skills at your disposal. There are seven special characters you can create using Earth mastery. To create a Conjurer you take a Spirit as a secondary mastery and to create a Elementalist you take a Storm secondary mastery. These are considered Full Caster classes. To create a Summoner you will pair with Nature mastery and that is considered a caster class. To be a Magician you take a Rogue secondary mastery, an Avenger takes Hunting as its secondary mastery, A Battlemage takes Warfare as its secondary mastery, and a Juggernaut takes Defense as its secondary mastery. They are considered Hybrid classes.
These hybrid classes (rather than pure masteries where only one is selected) merely give you more spells and actions to try in the game. Read through all the masteries before you decide on which to choose as you can't change them afterwards like you can change your skills. No matter what the two masteries you select, you are the one that will be creating the build. I can't tell you what a Summoner or Battlemage is going to play like, because you are going to create it customized to your playing style. It's all about the skills that you select rather than what the game will create for you.