Greetings, Rune Hunters. With the update on 9/10 (Thu), a new season begins and changes occur in various contents in Undecember. Among them, prior notice is provided for contents that will be reset or terminated, so please check carefully. ※ Contents are subject to change upon update. Auction House Reset Notice ◆ Some Auction House functions unavailable notice - Schedule: Sep 7, 2026 (Mon) 11:00 ~ Until the New Season update - Action ①: New item registration in the Auction House is unavailable. - Action ②: Bidding on existing auction items is not available. ※ Items already listed in the existing Auction House can be purchased by for the remaining time. Season \[The Forge] End Notice ◆ Move reference when converting to Standard Information on the season play items and criteria that will convert from Season \[The Forge] to Standard as the season ends. Move Contents Move criteria Chaos Statue Based on the higher Chaos Statue level between Season and Standard Medium Chaos Score Season/Standard Chaos score merge Mastery Based on the higher Mastery Level between Season and Standard Relic Based on the higher Relic Level between Season and Standard Light of Life Based on the higher amount of Light of Life Owned between Season and Standard Secret Tome Merged the unlock status of Season and Standard characters Currency Integrated the amount of Gold/Crystals (Courage/Proof) for Season/Standard Characters ※ For Gold, the amount is limited to the Max Owned value (1 billion) upon consolidation. Title Based on the higher progress between Season and Standard Achievement Based on the higher progress between Season and Standard Rune Birth Essence Mileage Season/Standard Character Merge Charm Slot Upgrade Based on the higher Enhance list Level between Season and Standard Rune Master EXP Season/Standard Rune Master EXP merge ※ Please note that the aggregation unit is , not . ◆ Temporary Storage Move Items Notice - Action ①: Items in the Season character's Storage will be moved to the . - Action ②: Items registered in the Season character's Unique/Rune Compendium will be moved to . - Action ③: Items in the Alchemy slot of Season characters will be moved to . - Action ④: Items owned in the mailbox of season characters will be moved to . ◆ Notice on deletion of existing temporary storage items - Items stored in the during the season \[The Forge] will be deleted and cannot be recovered upon the 9/10 (Thu) update. - Items in the temporary storage and temporary slots must be claimed by 9/10 (Thu). - Black Market items not claimed before the update on 9/10 (Thu) cannot be restored. ※ After the new season begins on 9/10 (Thu), items deleted from the previous season's temporary storage and temporary slots cannot be restored. ※ The information provided is subject to change during the update. Notice of Item and Point Deletion ◆ Summon ended - On 9/10 (Thu) update, all 3 types of Summon Unique in the Paid Shop will end, and accumulated bonus points will be deleted. - Owned Gear Summon Tickets and chests containing those tickets will be deleted during the 9/10 (Thu) update. ※ Please consume any owned bonus points and related items before 9/10 (Thu). ◆ Removed - White Night Crystal and chests containing the material will be deleted in the 9/10 (Thu) update. - In the new season, a new special material can be obtained and used instead of the White Night Crystal. ※ If White Night Crystal is owned, please consume it before 9/10 (Thu). Contents Reset Notice ◆ Reset - Card items and chests including the corresponding consumables will be deleted during the 9/10 (Thu) update. - Card system has been reset and will be operated as official contents from the new season. ◆ removed - On 9/10 (Thu) update, the Constellation of Time contents will be removed and integrated into the Chaos Dungeon event. - Options and Identify engravings of Zodiac Stones will be reset. ※ If the Constellation of Time is in progress, please complete it before 9/10 (Thu). ◆ Season Mode - On 9/10 (Thu) update, Chaos points and Chaos Statue levels obtained in Season Mode will be merged with the higher value between Season and Standard. ※ Chaos Statue information in Standard mode will not be reset. ※ Chaos Card, Traces of Memory, Exodium Card, Chaos Key, and chests containing these items will remain after the Sep 10 (Thu) update. ◆ Reset - On 9/10 (Thu) update, the Chaos Rune, Chaos Ring, and Wheel of Fate of the Chaos Statue will be reset. - Information equipped on Chaos Rune Cast, Chaos Runes owned in Storage and Bag, and Chest items containing Chaos Runes will be deleted. - Node information in progress in the Wheel of Fate will be reset. ※ Please claim any unclaimed rewards stored in the Chaos Ring before 9/10 (Thu). ※ Please complete any ongoing missions and nodes in the Wheel of Fate in advance. ◆ Reset - On 9/10 (Thu) update, the Abyss Gate progress stage and Gear Slot Upgrade values of the Chaos Statue will be reset. ※ Abyss Gate progress stage → Stage 1 / Gear Slot Upgrade value → Reset to Level 0. ※ Please claim any unreceived rewards from the Abyss Gate before 9/10 (Thu). ◆ Reset - On 9/10 (Thu) update, Black Market reputation, item list, saved products, and Pirate coins will be reset. - Owned Pirate Coins and Pirate Coin Chests will be deleted. ※ Products stored in the Black Market must be purchased before 9/10 (Thu). ◆ Reset - Relic and Zodiac will be reset during the 9/10 (Thu) update. - Relic level, EXP, and owned Light of Life are combined based on the higher value between Season and Standard. - All Avatar information will be reset, and Divine Points will be imbued according to the combined Relic level. ※ After the update on 9/10 (Thu), activation of the character's Relic Avatar, reset of Divine Points, and reset of Zodiac Trait and Stat Points are required. ◆ Reset - Solo Descent Raid information will be reset during the 9/10 (Thu) update. ◆ Reset - Mastery-related information will be reset during the 9/10 (Thu) update. - Mastery levels are combined based on the higher level between Season and Standard. ※ Reset of Mastery Points is required after the 9/10 (Thu) update. ◆ Reset - Rune Master Points consumed in and will be reset during the 9/10 (Thu) update. ※ After the 9/10 (Thu) update, resetting of the reset Rune Master Points is required. ◆ Reset - On 9/10 (Thu) update, progress and used will be reset. - Offering points from the previous season can be accumulated and used in the new season. ※ Offering points obtained in Season \[The Forge] will be retained until the new season. ◆ Reset - On 9/10 (Thu) update, and will be reset. ※ After the update on 9/10 (Thu), reset of God's Blessing and Character Traits is required. Please refer to the above information to avoid inconvenience while playing, and look forward to the new updates and new season. Thank you.

Greetings, Rune Hunters. An issue where some accounts in the Russia region are unable to access the game and use services. ■ Check Result Notice - There are no restrictions or blocks on access to specific regions in Undecember, and the servers are operating normally. - This issue is presumed to be due to local network conditions or the internet service provider (ISP) and is difficult to resolve through in-game measures. We ask for understanding that direct assistance cannot be provided to Rune Hunters experiencing inconvenience related to Undecember usage. If additional information related to this is confirmed, it will be announced through the Undecember official channels. Thank you.

Greetings, Rune Hunters. I'm Dusup Shin, the newly appointed PD of UNDECEMBER. Together with the development team, I will continue to further develop UNDECEMBER's unique brand of fun, and I will listen sincerely to the diverse feedback you, our Rune Hunters, share with us. As I greet you all from this new position, I'd like to first say that I look forward to working with you. "The Forge" Season is gradually approaching its final stretch. I find myself wondering whether you, our Rune Hunters, have been enjoying your journey through this season. While our development team works to bring "The Forge" Season to a stable close, we are also accelerating our preparations to showcase expanded combat and growth enjoyment in the upcoming new Season. In this Developer's Note, we would like to introduce some of the key changes we'll be unveiling through the new Season. \[New Season Content, "Eroded Boundary"] In this new Season, we will be introducing the new content "Eroded Boundary" (tentative name). "Eroded Boundary" combines a Wave Defense format, in which you hold off a relentless onslaught of enemies, with roguelite elements. Each time you break through a wave, you'll be presented with choices carrying different risks and rewards, and you, our Rune Hunters, will design your own strategy by weighing the current state of battle against how things may unfold afterward. Choices that carry greater risk offer more powerful rewards in turn, demanding careful judgment between challenge and stability at every moment. New rewards designed to raise the challenge value of this new content are also in development. This includes 4 new Essences obtainable from "Eroded Boundary", as well as Transcendent grade Link Runes and Unique Gear currently in preparation. Detailed acquisition methods and use cases will be introduced in more detail through a future Developer's Note. \[Major Overhaul of Channeling Skills] To provide a more dynamic and differentiated combat experience, we are adding new Channeling Skills, dedicated Link Runes, and Zodiac Specializations, while also undertaking a major overhaul of the existing Channeling Skill system. The new Channeling Skill Runes are being designed to combine convenient handling with powerful damage performance, and the 5 existing Channeling Skills will be reworked so that each skill's characteristics and usage method come through more clearly. In particular, skills that previously had to be used while standing still will be changed to allow continuous casting while moving enabling you to respond more flexibly to enemy attacks without breaking the flow of combat. Through this, we aim to ease the tendency toward concentrated adoption of specific skills, and support a wider range of build compositions utilizing Channeling-exclusive Link Runes and Zodiac Specializations. Detailed information on the new Channeling Skills, the specific changes to existing skills, and the dedicated Link Runes and Zodiac Specializations will be introduced in a future Developer's Note. \[Official Launch of the Card System] The Card System introduced during "The Forge" Season will become official content starting with the new Season. In line with its official launch, we are restructuring the system into a more intuitive structure where collecting Cards directly translates into growth. You, our Rune Hunters, will be able to clearly feel your stats increase as you collect more Cards, and you'll also be able to obtain special effects that become central to your build by completing specific combinations. The Card System is set to transform from simply collecting Cards into content where you can consider which abilities to secure and which direction to grow in. We will continue to refine the content so that the sense of accomplishment from collecting leads into the enjoyment of build crafting and optimization. \[Major Overhaul of the Constellation of Time] The Constellation of Time, which many of you, our Rune Hunters, have voiced concerns about, will undergo a full-scale overhaul that removes most of its existing structure. The core combat and reward elements previously offered through the Constellation of Time will be folded into the Chaos Dungeon, allowing you to experience them naturally during regular mapping without any separate, complicated entry process. Duey, the researcher who studied the Constellation of Time, will remain in Saluto and continue his existing work. He will continue to be in charge of appraisal engraving for Zodiac Stones, and will be waiting for you, our Rune Hunters. \[Zodiac Pass Special Material Improvements] We will also be improving the utility of the special materials granted through the Zodiac Pass. We are increasing by 100% the Essence acquisition rate bonus applied when using dedicated materials such as this Season's 'White Night Crystal,' and Essences obtained through this effect will be improved so that they all drop in a tradeable form. We will restructure the system so that Zodiac Pass rewards provide tangible utility during the mapping process, allowing you to feel a clearer sense of reward when using dedicated materials. \[Upcoming Schedule for the Next Season] We'd like to share the schedule for the update and detailed reveals for the new Season, which we know you, our Rune Hunters, are most curious about. 2nd Developer's Note Release: Thursday, August 27, 2026 Official Update Notes Release: Early September 2026 New Season Update: Thursday, September 10, 2026 Additionally, the Pre-Season Eve Attendance Event will run starting Thursday, August 6. Participating in this event will earn you a variety of rewards that will help with rapid growth in the early stages of the new Season, so please be sure to check the attendance calendar and participate without missing a day. \[We Await Your Feedback, Rune Hunters] If you have any feedback on the update direction shared in this Developer's Note, or anything else you'd like to tell us, please reach out through our official community, official Discord, or Support. While it may be difficult to reflect every piece of feedback immediately, we will carefully review each and every one, and use them as valuable reference material in determining the update direction not only for the new Season but for future Seasons as well. \[To conclude,] Beyond what we've covered in this Developer's Note, a variety of new elements and improvements are being prepared for the new Season. Details we haven't yet had the chance to introduce will be shared in sequence through upcoming Developer's Notes. Through new content, an expanded growth system, and overall quality-of-life improvements, we hope the new Season will be remembered as a meaningful journey for you, our Rune Hunters. We sincerely hope you'll join us for the upcoming Season as well, and all of us on the UNDECEMBER development team, myself included, will continue to think deeply and work tirelessly to provide you with an even better gameplay experience. Thank you for your continued support. Thank you.

Greetings, Rune Hunters. We would like to inform you that UNDECEMBER will undergo scheduled maintenance on Jul. 23 (Thu) to provide even more reliable game services. Please see below for more details on the maintenance schedule. Jul. 23 Scheduled Maintenance 1. Maintenance Schedule : Jul. 23 (Thu) 08:00 - 11:00 10:01 (UTC+9) 2. Maintenance Details [Go to Notice] 3. To Note ■ The maintenance schedule may change depending on circumstances. ■ Gameplay will be unavailable during maintenance, so please exit the game in a safe zone before maintenance begins. ■ Please note that you will not be able to enter the Abyss Gate , Auction House , Constellation of Time , Arena , Chaos Dungeons , and Eunos Dungeons for 10 minutes before and after the patch. We hope the information above will help you avoid any inconvenience as you play the game. Thank you.