6(b) is the relevant EULA section. However, don't be too quick to think your IP rights are gone...
The first part of the paragraph covers ideas that you didn't create. It simply asks you to acknowledge that you didn't own those things. For example - maybe you made an in-game character based on a TV show villain, or a recreation of Statesman with a gold and black costume. You never owned that IP anyway, and you're just acknowledging that fact. This protects
The second part asks you to agree to let NCSoft use your original characters and stories. It doesn't relinquish your IP rights to your characters or stories - it gives NCSoft a license to use them. For example, you might have created an original character - once you make that character in-game, you give NCSoft the right to use it in an advertisement for CoH, or sell miniatures of it. That license is perpetual and irrevokable, but non-exclusive. You don't lose your rights to use the character, and you can still license those IP rights to other people. The intent of this section is to protect NCSoft from a lawsuit by you.
They do, however, own the individual costume pieces and mission maps that you used to build your character or missions. If they withdraw your license to use those, then using the character creator or AE would violate the EULA. They have not yet withdrawn that license. They granted it to you in section 2.