Play games
Choose the game that interests you and play itfor free.
Complete the tasks
Every game has some tasks for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
Overall, I found TERA to be a bombastic mix of bleeding edge graphics and blazing gameplay in an enormous persistent world. I cannot express how much the change to action combat has enriched an already competent MMORPG.