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I, like many others, pre-ordered Aion back in the day. I made it to level 38 Templar before the Abyss grinding got to me. I just recently returned with this Free reactivation period, and all I can say is WOW! I am having a blast. At level 38 I was able to do a pre-quest, and enter a solo instance called Kromede's Trial.
I actually had a hard time with it at first! I had to use the tools they gave me, along with my own skills to progress in this dungeon. The first time through is a story mode sort of, but after that other doors open up and you can choose whether to kill the side bosses for their armor, or to leave them up and face a tough version of the final boss for a chance at a Yellow weapon. On my first time I decided to go for the weapon, and I got the key to drop !!! I was very lucky.
There are a lot of people on the NA servers. Constant PVP going on, and people seeking more players for different PVE instances and non-instanced groups.
If you played AION a while back, now is a great time to check it out again. It's going to be free, can't beat free.
P.S. The graphics are still some of my favorite in any game (2nd only to FFXIV).