https://ddo.com/en/anniversary
https://www.ddo.com/forums/showthread.php/508434-Celebrating-10-Years-of-Free-to-Play!
So it seems to be a mix of usefulness, or uselessness, depending on where you are:
- Sep 13 - 18 you can create L10 characters
- A coupon coming soon for the path of inspiration pack https://ddowiki.com/page/The_Path_of_Inspiration . Which these days is basically the pack you go into when you are trying to cap at 20 or finish off your 400 Coin Lords favor
- A chance to buy a +8 Supreme tome, and some other very useful goodies, in the DDO store for ~70% of what they normally sell a +8 supreme tome for