Overview
Beyond the Rails: Prime Circle is the permanent endgame challenge mode that opens once a player completes the main story prologue and reaches the appropriate Hunter Level threshold. The mode is structured as a ten-stage tower of progressively harder encounters with rotating buff and debuff modifiers. Each stage rewards 160 Annulith and Train Logs on a perfect clear, with reduced rewards for partial clears that still complete the stage objectives.
Prime Circle is positioned as the launch-window equivalent of a recurring spiral-tower mode found in other gacha action RPGs: it tests team breadth across multiple elements, encourages investment in two or three full team comps rather than a single hyper-built lineup, and resets on a cadence that lets dedicated players reclaim the headline rewards each rotation. Unlike a one-and-done campaign event, the stage layout itself is permanent. Modifiers shift and reward chests refill, but the boss matchups and arena geometry stay consistent across resets.
Stage Structure
Prime Circle uses ten linked stages, indexed Stage 1 through Stage 10. Each stage drops the player into a self-contained encounter with one or more pre-defined enemy waves and a final clear condition. Stages are gated: Stage N+1 unlocks only after Stage N has been cleared at least once, so the mode functions as a progression ladder rather than a free-pick tower.
A stage clear has two tiers. Standard Clear satisfies the win condition (kill the boss, defend the objective, escort the target, etc.) within the time limit. Perfect Clear additionally meets a stage-specific bonus condition such as no character deaths, all bonus targets eliminated, or a damage-window threshold hit during the boss's stagger phase. Only the Perfect Clear pays the full 160 Annulith reward; Standard Clear pays a reduced bundle that scales with the stage number.
Rewards Per Stage
Stage rewards stack across the entire ten-stage ladder. A full Perfect Clear of all ten stages within a single rotation yields the maximum payout; anything short of that returns proportional rewards for the stages that did clear.
Reward | Per Stage (Perfect) | Full Ladder Total | Notes |
|---|---|---|---|
160 | 1,600 | Equivalent to roughly 10 Solid Dice when fully converted; one of the highest premium-currency yields outside of the launch login event. | |
Variable | Per-rotation cap | Mode-specific currency. Train Logs are spent in the Prime Circle exchange shop on character ascension materials, Arc upgrade modules, and rotation-exclusive cosmetics. | |
First-Clear Bonuses | One-time | One per stage | Each stage has a one-time first-clear bundle paid the first time it is completed. Includes Annulith, Solid Dice, and upgrade materials. |
Cosmetic Drops | Rotation-locked | Limited per cycle | Profile frames, name cards, and travel-themed accessories tied to the Prime Circle rotation theme. |
Modifier Rotations
Each Prime Circle rotation applies a global modifier that shifts the meta for that cycle. Common patterns observed at launch include element-buff modifiers that boost a single element's damage by a flat percent, defensive debuffs that increase incoming damage taken by all party members, and tempo modifiers that alter cooldowns or stamina costs. The modifier set rotates on the same cadence as the rewards, encouraging players to build at least two team compositions that cover different elements.
Stage-level modifiers also stack on top of the global rotation. A given stage might enforce a no-healing rule, require maintaining an Esper Cycle reaction chain at all times, or place an environmental hazard such as falling debris or an anomaly field that drains stamina. Reading the modifier list before entering a stage is the single biggest swing factor in clear time.
Reset Cadence
Prime Circle resets on a fixed cadence at the start of each cycle. The reset clears all stage clear states, refreshes the modifier rotation, refills the per-rotation reward chests, and restocks the Train Logs exchange shop. Players who have already completed all ten stages can return at the next reset to claim the full Annulith and Train Logs payout again.
First-clear bonuses are paid once per account regardless of resets. Subsequent rotations pay the standard reward bundle for each Perfect Clear but do not re-issue the first-clear bonus. This rewards players who clear early and retain that progress without forcing them to repeat the same content for diminishing returns.
Recommended Team Building
Prime Circle rewards roster breadth more than character investment depth. Because the global modifier rotates and several stages enforce element-specific bonus conditions, a single hyper-built team will struggle to clear the full ladder under unfavorable rotations. The minimum recommended setup is two complete teams covering at least four different elements between them; three teams covering all six is the comfortable target for full Perfect Clear runs.
Suitable team archetypes for Prime Circle:
Anima follow-up team: Nanally as on-field DPS, Mint as Anima sub-DPS, Hotori as Cosmos support, Haniel or Edgar as Psyche/Cosmos healer.
Incantation hypercarry team: Baicang as on-field DPS, Adler as Incantation sub-DPS and shield, Sakiri as Incantation support and crowd control, Edgar as Cosmos healer.
Stagger break team: Daffodil as on-field break DPS, Hathor as Lakshana sub-DPS, Skia as Lakshana stealth and crowd control, Fadia as Psyche tank for survivability under damage-up modifiers.
Train Logs Exchange Shop
Train Logs earned in Prime Circle are spent in the dedicated exchange shop accessible from the Prime Circle hub. Stock rotates on the same cadence as the mode itself. Confirmed exchange categories include character ascension materials (Mind Shards for limited and standard pool characters), Arc enhancement modules, rotation-exclusive cosmetic profile frames, and one-time bundles for upgrade currencies.
Players should prioritize Mind Shards for whichever character they are currently investing in, since the Prime Circle shop is one of the few non-gacha sources for Mind Shards on limited characters such as Nanally and Hotori. Cosmetic items can be revisited on later rotations; Mind Shards leave the shop for several rotations after a character's first headline appearance.
Tips
Read every modifier before launching a stage. A no-healing modifier breaks any team that relies on Edgar or Haniel as the only sustain pick; an Esper Cycle modifier rewards teams that keep reaction uptime high.
Save Solid Dice or pity progress for whichever element the next rotation favors. Element-buff rotations make the corresponding banner character significantly more useful in Prime Circle than out of it.
Spend Train Logs on Mind Shards first, cosmetics second. The shop refills on a cadence that lets you grab cosmetics on a later rotation; Mind Shards go in and out of stock based on the character spotlight.
Push for Perfect Clear on Stages 1 through 6 before attempting Perfect Clear on Stages 7 through 10. The first six stages typically have manageable Perfect conditions; the late stages enforce strict damage windows that punish under-built rosters.
Stage clears persist across the rotation, so partial progress carries over. There is no penalty for spreading the ten stages across multiple sessions instead of clearing in one sitting.
If a stage has a no-deaths Perfect condition, swap into a tank or shield character such as Fadia or Adler before pulling the boss to lock in the bonus reward.