Chaos Zero Nightmare: How to Clear System Zero Runs

To consistently clear System Zero runs in Chaos Zero Nightmare, field a balanced three-unit team, keep combat decks trimmed to 12–15 cards, and route through rest nodes before facing sector bosses. Maintaining your team's sanity and budgeting Action Points (AP) around enemy intents prevents combat collapses during deep exploration runs.

Build a Balanced Three-Unit Squad

Running an all-offense lineup leads to rapid defeat because unmitigated enemy burst damage quickly depletes health and triggers mental stress cascades. A dependable expedition team requires dedicated coverage across three operational roles:

Role Type	Core Responsibilities	Target Deck Profile
Main Striker	High single-target burst, multiplier scaling	Low-cost attacks, setup buffs
Guardian	Taunts, barriers, team damage reduction	Retain shields, defensive cuts
Utility / Heal	Sanity recovery, AP gain, cleanses	Card draw cantrips, cleanse skills

Allocate the majority of your AP to your striker during burst opportunities. Use the guardian to absorb telegraphed enemy attacks, and rely on your utility support to sustain health and sanity. Neglecting defense forces you to spend recovery nodes on emergency healing instead of card upgrades or deck pruning.

Manage Action Points and Read Enemy Intents

Turn efficiency requires evaluating enemy intent icons above enemy health bars before queuing actions:

Heavy Attack Intents: When an enemy prepares a heavy single-target or multi-hit strike, prioritize guardian shields and barrier skills first.
Non-Damaging Intents: When enemies spend turns buffing or applying debuffs, invest your full AP pool into offensive burst cards to force phase transitions or eliminate active minions.
Minion Prioritization: Spend remaining energy after defensive requirements on removing fast-acting secondary enemies to cut down cumulative turn damage.

Never spend AP emptying a hand on unboosted basic strikes if it leaves your squad open to unshielded counterattacks.

Streamline Decks at Rest Nodes and Shops

Card bloat dilutes your draw pile, reducing the rate at which you draw vital defensive and burst cards. A lean deck of 12 to 15 cards allows your squad to cycle back to core abilities every two turns.

Remove Starter Cards First: At shops and rest nodes, prioritize purging starter strikes and basic defenses over purchasing new, marginal cards.
Skip Low-Synergy Card Rewards: After winning standard battles, select the skip option unless an offered card directly boosts your striker’s scaling or your support unit’s survival engine.
Upgrade Core Tools: Focus upgrades on primary defensive barriers and key resource-generating utility cards to maximize AP efficiency per turn.

Sector Routing and Boss Preparation

Path selection determines your squad's condition when entering sector boss encounters. Tracing node routes backward from the final chamber ensures stable progression:

Locate Recovery Nodes: Work backward from the sector boss to guarantee your path crosses a rest or campsite node immediately before the boss chamber.
Limit Consecutive Elite Combats: While elite battles yield better relics and currency, sustained attrition and sanity loss cause panic penalties that disable active skills or add dead status cards to your draw pile.
Alternate Combat and Mystery Nodes: Interleave standard combats with event nodes to minimize combat attrition while searching for beneficial buffs.
Manage Boss Charging Phases: When a boss enters a charged stance, save high-value crowd control or heavy shields specifically for that turn to survive high-damage attacks and break defensive thresholds. Switch from attrition to all-out burst play if an elite target begins stacking permanent attack buffs over extended turns.