Dot Abyss Deep Abyss Guide

Deep Abyss sits beneath idle exploration as a roguelike endgame. Every run costs a Gate Key — a separate currency from exploration stamina. Keys drip from weekly missions, event shops, and milestone rewards once you clear main story chapter 3 and unlock the crimson portal at the Frontline Base. Most accounts receive their first key from the beginner track; spend it only after locking a proven party, because a wasted run still burns the key. Duplicate Abyss Codes can be traded for keys in the exchange shop, making code farming a legitimate F2P strategy. See the items guide for the full currency breakdown.

1. Clear main story chapter 3 to unlock the Deep Abyss portal beside idle exploration.
2. Collect Gate Keys from weekly missions, events, and beginner milestones.
3. Optionally bank Abyss Codes from early runs and exchange them for extra keys.

Each Deep Abyss run is a self-contained roguelike: your party locks at entry — no mid-run swaps, equipment changes, or stance edits. Treat party selection as a commitment. HP carries between floors as a persistent resource; there is no automatic full heal between battles unless you pick a rest node or consumable reward.

• Erosion (侵蝕) stacks as you climb, reducing max HP and sometimes weakening skills until the run ends.
• The map branches after every few floors with reward nodes, shops, and elite encounters.
• Unlike idle exploration, depth progress here resets when you exit — only codes and permanent unlocks persist.
• Boss floors arrive every 10 layers with fixed patterns and heavier code drops.

Open Deep Abyss from the Frontline Base map — the crimson portal appears beside idle exploration once chapter 3 clears. The run map shows your current floor, upcoming boss markers, and fork choices.

• Abyss Codes drop from chest nodes, boss clears, and milestone floors; they appear in the run summary and the permanent Code Exchange menu at base.
• The preview screen lists recommended elements and enemy families on early floors — read it before tapping start.
• Layer-100 hunters should cross-reference the tier list to confirm their locked backs can survive that deep.
• Permanent Deep Abyss upgrades purchased with codes show in the base facility menu after each run.

HP management is the real boss of Deep Abyss. Front-line units absorb most chip damage, but Back attackers still lose max HP if the front collapses early.

• Prioritize sustain at rest nodes: a full heal beats a marginal damage buff unless you are speed-farming low floors for codes only.
• Erosion cannot be fully cleansed mid-run — only slowed — so skip optional elite fights when HP is below half.
• Assist healers matter more here than in base defense because there is no turret safety net.
• Equipment with HP% and erosion resist outvalues raw attack once you pass floor 30.

After each boss on floors 10, 20, 30 and so on, you choose: Return to base (banking all codes and chest loot collected) or Continue deeper (risking everything for better drops).

• The safe rhythm for most accounts: push to floor 20–30 on your first key, return, and bank codes before attempting a marathon.
• Continuing past floor 50 without a mature roster is how keys die to erosion attrition.
• Layer 100 clears unlock the prestige reward track and the first consistent Rank 5 gear drops — a late-game goal, not a week-one target.
• Completing a run (return or full descent) always grants milestone progress toward permanent Deep Abyss upgrades.

Speed-runners optimize around Impact emblem cycling because bosses have large HP pools and long timers. Code value peaks on boss multiples of ten — never skip the floor-10 boss if you still have healing charges.

• Pair an Impact generator (Nina, Wendy on counter) with spenders (Electra, Vira) in your locked Front4/Back3 spread.
• For F2P accounts, two short code-farming runs beat one failed push to floor 50.
• When hunting layer-100 Rank 5 gear, use a proven template: Front4 tank, Back3 DPS core, Assist3 healer plus buffer.
• Compare your locked roster against the tier list before burning a key on a deep push.