OUTERPLANE Season 3 EP1-15 Guardian of the Grave Boss Guide

To clear Season 3 EP1-15 and defeat the Guardian of the Grave in OUTERPLANE, field a team that moves before the boss to strip its defensive shields, control its Weakness Gauge, and unleash burst damage during the Break window. Without dispels and speed tuning, the boss stacks barriers and ramps up party-wide area damage until your team wipes.

Boss Mechanics and Threat Priorities

The Guardian of the Grave alternates between heavy single-target strikes and an escalating area-of-effect (AoE) attack. Two key mechanics dictate the fight:

• Defensive Barriers: The boss periodically grants itself shields that absorb incoming damage. If allowed to remain active, these shields stall your damage dealers and extend the encounter into an enrage wipe.
• Weakness Gauge (WG) and Break: Damaging the boss reduces its Weakness Gauge. Depleting the gauge triggers a Break state, which cancels upcoming boss turns, lowers its defensive resistances, and significantly amplifies all incoming damage.

Recommended Team Roles

Clearing this stage requires four core combat functions: turn acceleration, shield removal or defense reduction, dedicated single-target burst, and debuff cleansing with sustained healing.

Speed Tuning and Turn Order

Tune your hero Speed stats to ensure your squad acts before the Guardian takes its opening turn:

1. Turn Accelerator (Highest Speed): Moves first to grant party-wide Action Gauge and offensive buffs, pulling the rest of your squad ahead of the boss.
2. Debuffer / Stripper (Second Speed): Moves immediately after to strip the guardian's barrier and apply Defense Down before your attackers strike.
3. Primary DPS (Third Speed): Lands heavy single-target hits against the unshielded, defense-reduced boss.
4. Healer / Cleanser (Lowest Speed): Cleanses party debuffs, tops off health bars, or reserves utility skills for incoming boss damage cycles.

Weakness Gauge and Chain Execution

Manage your Chain Points (CP) carefully rather than spending them on low-tier attacks during standard phases.

1. Chip the Gauge: Use basic multi-hit attacks and dual attacks in early turns to deplete the Weakness Gauge without burning major Burst resources.
2. Trigger the Break: Deplete the final segment of the Weakness Gauge with an attack that queues a four-character Chain Skill to maximize turn delay on the boss.
3. Unload Burst Skills: Once the boss enters Break, spend accumulated CP on Level 2 or Level 3 Burst skills with your primary carry to exploit the damage amplification window.
4. Hold Defensive Cooldowns: As the Break state ends, hold your healer's mitigation and cleansing skills to absorb the boss's recovery attack.

Troubleshooting Stage Failures

• Party dies to AoE damage: Swap offensive accessories on your supports and DPS for flat HP or Defense main-stat gear to survive the boss's escalating area attacks.
• Shields absorb your burst window: Increase the Effectiveness stat on your debuffer so dispel skills and Defense Down bypass the guardian's innate resistance.
• Boss enrages before Break: Include dual-attack enablers or heroes with multi-hit basic skills to deplete the Weakness Gauge across fewer combat turns.