SHIELD WALL
Durationup to 3 min
TriggerScheduled
Effects
A shield worth 2% of the boss's max HP blocks every hit: the boss takes nothing until it breaks.
Rewards
Break it: every hitter gets an IRON CHEST, the top breaker a CURSED CASKET.
How often
7.1% when a scheduled event is selected.
Source: official game library. Scheduled percentages describe event selection, not the chance per attack.