Core Link is the late-game stat system in RF Online Next that unlocks at character level 55 and raises Combat Power through repeated enhancement attempts on six separate modules. Each attempt consumes one enhancement kit, and the odds get worse the higher you climb. The system is also the target of a paid Cash Shop bundle, the Core Link Upgrade Pack, which sells for USD 19.99 and bundles enhancement kits and reset items together.
Quick answer: Enhance one module at a time using its own kit, stop at 5 failures, and confirm progress by watching the module’s level counter and your Combat Power figure rise on the Core Link screen.
The six Core Link modules and what each one raises
Core Link is split into six parts, and each is enhanced on its own track with its own kit. The stats they grant do not overlap much, so the part you push first should match how you play. Levels 7, 14, 21, 28, 35, and 42 each hand out an extra enhanced option effect on top of the normal stat growth, which makes those the sensible stopping points.
| Module | Stats it raises |
|---|---|
| Armor Expansion Panel | DEF, PVP Damage Mitigation, Skill Dmg Reduction, Crit Resistance, Critical Hit Damage, ACC, Fixed Skill Damage |
| Fusion Reactor | ATK, Weapon ATK, HP Injury Recovery, Critical Hit Rate, Fixed Skill Damage Resistance, Fixed Damage Resistance, Max HP |
| Predictive Computing Module | Fixed Min Damage, DEF Pierce, Debuff Hit Rate, Critical Damage Boost, Evasion, Max ATK Resistance, HP Regeneration |
| Boost Controller | Weapon ATK Resistance, Debuff Resistance, Skill Damage Boost, Critical Damage Reduction, Fixed Damage, Max ATK HR, FP Regeneration |
| Synthetic Nerve Fiber | DEF, Crit Resistance, Skill Damage Boost, Max ATK HR, ACC, Fixed Skill Damage Resistance, Max HP |
| Core Processor | ATK, Critical Hit Rate, DEF Pierce, Skill Damage Reduction, Max ATK Resistance, Evasion, Fixed Skill Damage |
Stat gains are random on each success. There is no need to fish for a specific roll, because once a stat’s grade indicator hits Mythic in the top-right corner, the system moves on and starts feeding growth into a stat that still has headroom. A Mythic-grade stat does not reduce your chance of a successful enhancement.
How the enhancement loop works, and where it stops
You will see the failure counter working against you well before the cap. A run on the Armor Expansion Panel that reaches level 15 can already sit at 5 of 6 on its failure limit, at which point one more bad roll ends that module’s progress.
Resetting a locked module and using the second preset
A reset wipes the part’s progress and lets you start the enhancement track again from the beginning. That means your Combat Power drops noticeably the moment you confirm it, so a reset is not something to run mid-war. Some of the enhancement materials are returned when you reset, so the attempt is not a complete write-off.
Resetting a part costs one Enhancement Reset Chip. If you do not have a chip, the game will take 500 Diamonds instead.
Core Link supports two presets. The standard approach is to build Preset 1 up first, then move on to Preset 2, so there is always one configuration equipped and intact while the other is rebuilding after a reset. Level 42 is hard to reach, so treating 28 or 35 as the real target and alternating presets is the more reliable path.
Where enhancement kits come from
Every part uses its own dedicated kit, and the cheapest way to get each one differs. Two of them can only be obtained through crafting or the shop, which is worth knowing before you plan a long push.
| Kit | How to obtain |
|---|---|
| Armor Expansion Panel Reinforcement Kit | Monster hunting at level 75+, some boxes, market |
| Fusion Reactor Enhancement Kit | Crafting from Epic grade equipment, some boxes, market |
| Predictive Computing Module Enhancement Kit | Crafting with Arcane Nodes, some boxes, market |
| Boost Controller Enhancement Kit | Monster hunting at level 72+, crafting with Baerer Credit Notes, some boxes, market |
| Synthetic Nerve Fiber Reinforcement Kit | Crafting only |
| Core Processor Enhancement Kit | Shop purchase with Diamonds |
Market prices swing hard on the parts that drop from high-level field monsters. Armor Expansion Panel kits have listed as low as 233,333 on the market, so it is worth checking prices before committing materials to a craft.
Crafting costs for Core Link kits
Crafting removes your dependence on drops and market listings, but the material bills are heavy. The Synthetic Nerve Fiber kit in particular consumes other Core Link kits, so it sits at the top of the cost chain.
| Kit | Materials required |
|---|---|
| Fusion Reactor Enhancement Kit | 4x Epic Equipment (Tier 1), 16x Epic Equipment (Tier 2) |
| Predictive Computing Module Enhancement Kit | 500 Arcane Nodes, up to 50 crafts per day; 800 Arcane Nodes after that limit |
| Boost Controller Enhancement Kit | 800 Baerer Credit Notes |
| Synthetic Nerve Fiber Reinforcement Kit | 5x Armor Expansion Panel kit, 5x Fusion Reactor kit, 1x Predictive Computing Module kit, 5x Boost Controller kit |
Tip: the daily craft limit on the Predictive Computing Module kit is the one number that changes your planning. Spreading a large batch across several days keeps every craft at the 500 Arcane Node rate instead of the 800 rate.
What the $19.99 Core Link Upgrade Pack contains
The Core Link Upgrade Pack is sold in the Cash Shop for USD 19.99. It is a bundle of selection chests rather than a fixed set of kits, so you choose which module the kits apply to when you open them.
| Contents | Quantity |
|---|---|
| Pick-up x11 Summon Ticket Selection Chest | 1 |
| Link Enhancement Kit Selection Chest (Bound) | 50 |
| Enhancement Reset Chip (Bound) | 13 |
The Link Enhancement Kit Selection Chests are opened from your inventory, where you pick the module you want kits for. A single opening session can produce 25 Fusion Reactor Enhancement Kits, or four Boost Controller Enhancers, depending on what you select.
The 13 bound Enhancement Reset Chips are the part worth weighing. Each one replaces a 500 Diamond reset cost, and resets are the bottleneck on any module that stalls at the 5-failure limit.
What one pack’s worth of kits actually moves
Spending a full pack across several modules produces a measurable but not dramatic jump. A run that pushed the Fusion Reactor from level 0 to 36, the Boost Controller from 18 to 28, the Predictive Computing Module from 3 to 10, and the Armor Expansion Panel to 15 moved Combat Power from 138,495 to 143,869, a gain of 5,374.
That figure is the right yardstick to hold the purchase against. It is a single-digit percentage bump on a character already sitting near 140,000 CP, and it does not carry a module to the level 42 cap.
Confirming an enhancement worked
A successful attempt raises the module’s level counter by one and adds a randomly selected stat increase, visible on the part’s detail panel. The Combat Power number on your character sheet updates in the same moment. At the milestone levels of 7, 14, 21, 28, 35, and 42, an additional enhanced option effect is attached to the part.
If the enhance button stops responding on a part, there are only two reasons. Either the failure counter has reached 5 and the part is locked pending a reset, or you have no remaining kit for that specific module. Kits are not interchangeable between parts, so a stack of Fusion Reactor kits will not advance the Boost Controller.
Core Link sits mid-table in the overall progression order, unlocking after Combat Module at level 50. Equipment enhancement and leveling still deliver larger Combat Power gains for less material, so pushing Core Link past its early milestones makes most sense once those cheaper avenues are already worked through.
