Raid TL;DR

• Hiero's 10 second curse is the biggest run killer due to its random target selection.
  • It will explode and deal AoE damage, so even nearby students will take damage. As compensation, it also increases recovery, making it easier to reach the 100% HP curse removal condition. However, most runs choose to reset until certain students are selected to withstand it.
• There is a green relic on the field with 0% HP. Every time it's fully healed, it debuffs Hiero for +55% damage taken, stackable 5 times.
  • However, for 20 seconds after its hp depletes, recovery is cut in half. You can either wait 20 seconds to heal it again or effectively heal 200% HP to force an activation.
• For INS/TOR, there's also a purple relic with full HP. When destroyed, it will increase your students' ATK by 25% but cripples recovery. It also debuffs Hiero for a 1500 DEF reduction.
  • The curse recovery buff, after the purple relic activation, effectively nullifies the recovery debuff.
• Hiero has 2,900/6,500 DEF for a 64%/80% damage reduction. DEF down is highly recommended.