Xeldan is partially correct. If you wish to progress through the main questline raid zones in Ikisith, you will need to complete your main quest. However, there is a non-main quest method to get to Ikisith usable by just about anyone. Check out the crate on the docks in North Wastes of Tarhyl for more information (actually both the main quest and non-main quest options go through that crate).
I thought you needed to do your Main Quest for the other way too. Am I wrong? Shoot, I was slaving over COI on my non-jailed toon to try to get access.
Tried the solo quest with my 54 Bard, MQ not completed.
Hailed a Large empty crate in North Tarhyl and nothing happened, no dialog, no zoning.
Either there is a prerequisite of some sort or I'm missing something.
finished the group one here its pretty tough but yeah you do need faction aug it looks like to progress with mq lady. The solo quest i did prior to this and i didnt even need to talk to her to get a flag. Hope that helps.