I contacted support about it back in January and they won’t do anything about it lol
this was the response I got back
“GM Klyde (Blade and Soul)
Jan 25, 2022, 11:41 PST
Hello there,
Thank you for contacting Blade and Soul Support Team.
Please know that it's intended that the Illusion weapon is not included in the New 365 Day Premium Membership reward. The event page will be updated soon.
We're sorry for any inconvenience this has caused you. If there's anything else that we can help you with, please let us know.
Regards,
GM Klyde
NCSOFT Support Team”