Fjall is a 5-star Defender in Arknights: Endfield who wields a sword and deals Cryo-element damage. His full name is Korlek Fjall, and he belongs to the Endfield Industries faction. Despite his Defender classification, Fjall functions as a hybrid combat healer — a former legendary warrior who left violence behind to practice medicine, only to find himself drawn back into the fight under the Endministrator's command.
Quick answer: Fjall is a sword-wielding Cryo Defender whose battle skill and ultimate both heal allies, making him one of the few Defenders in Arknights: Endfield who doubles as a team medic.
Fjall's Background and Lore
Korlek Fjall was once known as the legendary Beastslayer of the Order of Steel Oath. Despite that fearsome reputation, Fjall grew tired of endless carnage and chose to leave the Order. He returned to the Civilization Band and took up the medical profession, trading his blade for a surgeon's kit. After multiple disappointments, Korlek eventually agreed to join Endfield Industries.
His in-game quote — "Think before you act, Endministrator" — captures his soft-spoken, cautious personality, which stands in sharp contrast to his violent past. Fjall is a male Lupo, stands 180 cm tall, and has eight years of combat experience. His date of birth is February 21st, and his place of birth is undisclosed. His Chinese name, 大山, literally translates to "Big Mountain," a playful nod that fans of the original Arknights have compared to the operator Mountain from that game.
Fjall's Base Stats (HP and ATK by Promotion)
Fjall's stat progression emphasizes survivability, which fits his Defender role. His HP and ATK scale across six promotion tiers, from Elite 0 through Elite Max.
| Promotion Tier | HP | ATK |
|---|---|---|
| Elite 0 | 354 | 33 |
| Elite 1 | 786 | 73 |
| Elite 2 | 1,186 | 110 |
| Elite 3 | 1,779 | 164 |
| Elite 4 | 2,649 | 245 |
| Elite Max | 3,908 | 361 |
Promotion thresholds require reaching specific levels: Elite 1 at level 20, Elite 2 at level 40, Elite 3 at level 60, and Elite 4 at level 80. Specific promotion materials have not yet been confirmed. His secondary stats — Strength, Agility, Intellect, and Will — along with Critical Rate, Attack Speed, and Attack Range values remain unconfirmed at this stage of the game's development.
Fjall's Combat Skills
Fjall's kit revolves around dealing Physical damage with his sword while keeping teammates alive. His basic attack is a five-hit slash combo. When you control him directly, the final strike in the sequence also inflicts 20 Stagger on the target. He can perform dive attacks from mid-air, dodge attacks immediately after evading, and finisher attacks against Staggered enemies that deal massive Physical damage and restore some SP.
Terminal Disassembly is Fjall's battle skill. He dashes toward a target location and delivers two strikes, with the second hit dealing more damage than the first. If either attack connects, the operator on your team with the lowest HP percentage recovers health equal to 30% of the damage this skill deals. This makes Terminal Disassembly both an offensive gap-closer and an emergency heal. When positioned well, it can interrupt enemy attacks twice thanks to its two-hit structure.
Hyperdose Formula is Fjall's ultimate ability. Activating it heals all operators on the team and then boosts their attack for 10 seconds. The exact percentage of the attack buff has not been finalized. The best time to use Hyperdose Formula is when multiple teammates are low on health or when their own ultimates are ready, so the attack increase amplifies the whole team's burst window.
His combo skill trigger and exact multipliers for all abilities are still pending confirmation.
Compound Medicine Talent
Fjall's signature talent, Compound Medicine, directly amplifies his healing output in critical moments. At Elite 1, his healing effect increases by 40% when targeting allies whose HP has dropped below 40%. At Elite 3, this bonus rises to 60%. This talent synergizes naturally with Terminal Disassembly, which already targets the lowest-HP teammate — the combination means Fjall's emergency healing becomes dramatically stronger the closer an ally is to going down.
Fjall's Base Skills
Outside of combat, Fjall contributes to your base operations through two passive skills.
Incredible Loot is available from Elite 0. Assigning Fjall to the Recycler increases its efficiency by 20%, making him immediately useful for resource processing even before you invest in promotions.
Serious Negotiation unlocks at Elite 4. When assigned to the Trader, Fjall reduces the value required from orders by 10%. This is a late-game economic bonus that rewards fully promoting him.
How Fjall Fits Into a Team
Fjall occupies a niche that few other Defenders in Arknights: Endfield fill. He is not a pure tank — his value comes from blending frontline durability with consistent healing. His battle skill lets him stay aggressive while passively sustaining the weakest member of the squad, and his ultimate provides a team-wide heal plus an offensive steroid. This makes him especially strong in prolonged fights where chip damage accumulates, and dedicated healers might struggle to keep up.
You'll want to use Fjall's Active Skill proactively to disrupt incoming enemy attacks rather than saving it purely for healing. Because Terminal Disassembly involves a forward dash, positioning matters — aim it so both strikes connect to maximize both the damage and the heal. His ultimate, Hyperdose Formula, pairs well with burst-oriented teammates who can capitalize on the temporary attack increase.
Fjall's Cryo element and sword weapon type place him in the same Defender pool as operators like Ember, Snowshine, and Catcher, but his healing hybrid design gives him a distinct role. Whether he ends up as a mainstay or a situational pick will depend on final multiplier tuning and how endgame content demands are shaped, but his toolkit already points toward a flexible, self-sufficient frontliner who keeps the whole team standing.