A new Legendary Hero, Hayeon of the Guardian of the Boundary, has been added to Seven Knights Re:BIRTH. Hayeon is a Support-type hero who disrupts enemies using Bleed and Paralysis, while providing ally debuff removal, healing, and turn-based buff extensions. Along with Hayeon's addition, her exclusive equipment 'Hayeon's Clear Mirror' has also made its debut.

Her passive skill, Abyssal Penitent, is central to Hayeon's kit. Hayeon possesses an ally Role Support effect. Because heroes placed in the team receive an additional Role +1 deployment effect based on their class, this opens up possibilities for diverse team compositions. Furthermore, Cover and Might are applied to herself. When Might activates, she gains a shield and applies HP Swap, Incurable, and Buff Block to the enemy with the highest current HP.

All allies receive a heal proportional to Hayeon's maximum HP once per battle when their HP drops to 50% or lower. At Transcendence 2, a shield is added under the same condition, and at Transcendence 6, she can inflict All Attack Power Reduction on Offensive and Magic-type enemies, and Defense Reduction on Defensive, Support, and Universal-type enemies.

Her basic attack attacks 2 enemies and inflicts Bleed with a certain probability. Skill 1, Binding Resolution, is a skill aimed at removing buffs, inflicting Bleed, increasing turn-based debuff durations, and inflicting Paralysis on all enemies. Bleed is applied based on the number of buffs removed. Skill 2, Moon Sealing Gate, is a support skill for all allies. It cleanses debuffs from allies and grants continuous healing for each debuff removed. In addition, turn-based buff extensions are applied, and skill enhancement adds a 1-turn All Damage Immunity effect. Overall, she is a hero armed with a wide range of utilities, including ally debuff removal and turn-based buff extensions, as well as enemy buff removal and turn-based debuff extensions.

The new hero Hayeon can also be awakened upon release. Awakened Hayeon retains her base form's kit structure while featuring enhanced basic attacks and skill effects. Her basic attack gains increased damage and Bleed probability, while Skill 1, Binding Resolution, sees higher Bleed and Paralysis probabilities.

Skill 2, Moon Sealing Gate, sees its continuous heal duration increased to 3 turns, with the 1-turn All Damage Immunity effect applied by default. Her passive skill, Abyssal Penitent, also gains an enhanced Cover probability and ally healing values, as well as an added Awakening Gauge gain when an ally or enemy dies. Her Awakening Skill, Heavenly Sealing Gate, reduces all allies' skill cooldowns by 20 seconds while inflicting skill cooldown increases and Buff Block on all enemies. Upon skill enhancement, it also provides a shield proportional to Hayeon's maximum HP to all allies.

Existing Legendary Hero Velika has also received an Awakening. Through this adjustment, Velika's identity as a Magic-type hero specialized in Tower of Infinity and Tower of Trial has been strengthened. Her basic attacks, Meteor, and Dark Phantom now deal bonus damage exclusive to Tower of Infinity and Tower of Trial. In tower content, Meteor applies turn-based buff reductions and defense-ignoring damage, while Dark Phantom utilizes piercing damage and a Silence effect at Transcendence 6.

Tolerance of the Tower has been added to her passive skill, Blessing of the Dark Moon. This allows Velika to be deployed without role restrictions in Tower of Infinity. She gains increased Critical Rate, a shield, and skill cooldown reduction upon enemy death, while granting increased Damage and Critical Damage in Tower of Infinity and Tower of Trial to all allies. Velika's Awakening Skill, Witch's Shadow, is a skill that inflicts HP Conversion and piercing damage on all enemies. Its damage increases upon skill enhancement.

New PvE content, Abyss Conquest, has also been added. Abyss Conquest can be accessed through the Raid menu in the lobby and becomes available after clearing Adventure Normal 12-10. Entry requires an Abyss Pass, with 1 ticket distributed daily at 9:00 AM.

A total of four bosses appear in Abyss Conquest, rotating on a two-week basis. Entry periods are divided into Friday 9:00 AM to Monday 8:59 AM, and Monday 9:00 AM to Thursday 8:59 AM. The period from Thursday 9:00 AM to Friday 8:59 AM serves as a rest period.

Team formation consists of 15 heroes and 3 pets. The combined Combat Power of the heroes and pets is displayed, and deploying them according to the guided bonus rules yields bonus points after combat ends. Battles proceed automatically upon entry, and results can be checked instantly using the Skip button in the top right. Rewards are divided into Grade Rewards based on combat score and Milestone Rewards based on total hero and pet Combat Power. Note that rewards based on accumulated account Combat Power to date can be claimed all at once when accessing Conquest mode, so be sure not to miss them.

In-game system updates have also arrived. First, existing Quests, Expedition events, and the Content Status Board have been consolidated into the Adventurer's Guide. The Adventurer's Guide consists of Path of the Adventurer, Quests, Content Status Board, and Item Guide categories, providing source locations and shortcut features for currencies needed for hero growth, equipment growth, and summoning. In Path of the Adventurer, players can complete specific conditions to claim rewards and increase their tier, earning various gifts including Former Seven Knights through group rewards.

A Reserve Key feature has also been added. When the basic key count reaches or exceeds the auto-recharge limit, Reserve Keys are recharged separately and automatically converted at a 1:1 ratio when basic keys run short. Reserve Keys recharge every 480 seconds, up to a maximum capacity of 18,000. The daily usage limit is 6,000, resetting every day at 9:00 AM.

Melkir's Lab receives Rate Up and Star Grade calibration features. Players can use 1,000 Rubies to boost the drop rate of the 5th slot in Dark Magic Prediction results, which proportionally reduces the acquisition rates of slots 1 through 4. Additionally, while Dark Magic Experiments previously accepted only 6-Star heroes as materials, 4-Star and 5-Star Legendary Heroes can now also be registered by spending extra Gold. 4-Star Legendary Heroes require 200,000 Gold, while 5-Star Legendary Heroes require 150,000 Gold.

Raids and Growth Dungeons have been reduced from 15 stages to 5, with a new Stage 6 added. Stages per territory in Normal and Nightmare Adventure modes have also been reduced, adjusted to 10 stages for the Asd Continent and 20 stages for the Aisa Continent and Forgotten Sanctuary. Due to the consolidation of tiers and stages, content progress may be partially adjusted, but the total amount of First Clear Rewards and obtainable regional rewards remains identical to before. Stages with no previous clear record can be entered for free.

In addition, reward systems for Pick-Up Hero Summons and team formation features for Real-Time Arena friendly matches have been added. For new costumes, Velika's Rare Costume 'Fair Lady' and Knox's Rare Costume 'Snowfield Destroyer' have been released and can be found in the Wardrobe. Meanwhile, lobby UI improvements have been implemented, making features such as Synthesis, Seven Knights Chess, and Melkir's Lab accessible via the top-right menu button.

New events have also kicked off. The Fresh Breeze Thanksgiving Selection Summon Event allows players to select one hero among 4-Star Sunran, 4-Star Yoongun, and 4-Star Dongyeong for their Wishlist. Players can participate using Pick-Up Hero Summon Tickets and Rubies, sharing pity gauge progress with the Pick-Up Summon banner. After maintenance on October 1, 4-Star Hayeon will also be added to the Selection Summon pool.

Rewards based on cumulative summon counts are also available. Milestone rewards can be earned from 10 to 800 summons, featuring key items such as Gold, Hero Summon Tickets, Awakening Stones, Exclusive Equipment Selection Boxes, Key Boxes, Shining Skill Upgrade Stones, Essence of Chaos, and Tuning Crystals.

A Fresh Breeze Thanksgiving Push Event is also taking place. Logging in during designated reward claim windows throughout the event period allows players to receive gifts via in-game mail. Rewards include Free Rubies, Hero Summon Tickets, Awakening Stones, Key Boxes, Shining Skill Upgrade Stones, Essence of Chaos, Pet Summon Tickets, Tuning Crystals, and Essence of Oblivion. Free Rubies will be distributed across multiple installments, totaling 3,000 Rubies when all are claimed.

An Exclusive Equipment Support Event is also being held. Players can earn exclusive equipment rewards by completing various missions such as spending Keys, summoning equipment, enhancing and tuning exclusive equipment, participating in Sudden Raids, and playing in the Arena. Key rewards include Exclusive Equipment Wish Summon Tickets, Tuning Crystals, Gold, and Special Exclusive Equipment Support Boxes I–V. When using Special Exclusive Equipment Support Boxes I–V, players receive all exclusive equipment for multiple heroes contained in the box. If duplicate exclusive equipment already owned is obtained, it is converted into 500 Tuning Crystals.