OUTERPLANE Masterless Guardian Boss Team Guide

To clear the Masterless Guardian event boss in OUTERPLANE without relying on a dedicated healer, run an aggressive four-hero lineup featuring Tamara, Notia, Rhona, and Maxwell. This setup bypasses defensive attrition by using Tamara's debuffs to trigger Notia's out-of-turn pursuit attacks, stripping the boss's Weakness Gauge before dangerous attack sequences cycle, and finishing the encounter with Maxwell's defense-penetrating burst during the Break window.

Recommended Lineup and Hero Roles

This composition replaces traditional sustain units with offensive enablers and self-sufficient attackers. Each character fulfills a specific mechanical requirement to control the boss's turn flow and damage output.

Turn Order and Follow-Up Synergy

Maximizing damage requires synchronizing attacks so Notia consistently triggers her pursuit passive outside her normal turn order:

1. Tamara initiates: Tamara must act first to apply Defense Down and offensive stat suppression to the Masterless Guardian while granting Critical Hit Chance and Critical Hit Damage buffs to the party.
2. Allies attack debuffed targets: When Rhona and Maxwell strike the debuffed boss, Notia automatically follows up each allied attack with an extra pursuit strike.
3. Chain generation: Generating five to six actions per rotation accelerates Weakness Gauge reduction and quickly builds Chain points without giving the boss uninterrupted turns.

Managing Sustain Without a Healer

Surviving incoming damage without support units like Tio or Saeran relies on two specific mechanics:

• Rhona's Frontline Lifesteal: Rhona absorbs incoming hits and recovers her health pool directly through damage dealt. Maintaining offensive uptime keeps her healthy without external healing.
• Rapid Break Stuns: The Masterless Guardian's most lethal attacks require multiple uninterrupted turns to cycle. Chipping the Weakness Gauge with multi-hit attacks and Notia's pursuit follow-ups forces an early Break state, canceling the boss's attack momentum before enrage thresholds occur.

Stat and Gear Priorities

• Tamara (First Action Priority): Equip a Speed Set with high Effectiveness. She must outspeed the boss to place her Critical buffs and ensure Defense Down lands before your other heroes act.
• Notia & Maxwell (Damage Scaling): Equip Attack, Critical Damage, or Penetration sets. Because Tamara provides a party-wide Critical Hit Chance buff, prioritize raw Attack and Critical Damage substats over excess base Crit Rate.
• Rhona (Bruiser Sustain): Equip Attack, Defense, or Lifesteal sets. Increasing Rhona's damage output directly scales her self-healing return, preventing collateral area-of-effect damage from wearing her down.

Break Phase Execution

Hold high-cost burst skills while the Masterless Guardian's shield bar is intact, as active shields dampen outgoing damage. Once the Weakness Gauge reaches zero and the boss enters Break status, execute the following sequence:

1. Launch a 4-hero Chain Attack immediately upon entering the Break window.
2. Place Rhona and Tamara in the opening slots of the Chain Attack.
3. Assign Maxwell to the fourth Chain Attack slot to grant him the highest cumulative damage multiplier.
4. Cast Maxwell's Skill 3 directly after the Chain sequence, using his accumulated Knowledge stacks to bypass the boss's remaining defense and finish the fight.