Shrine of Perdition [EXTREME]

Wave 1 has a Grangarrod, wave 2 a Cyclops, wave 3 one of each. Both have very high HP. Every 15s, Grangarrod applies a stackable Paralysis RES DOWN (50s) to your whole team and Cyclops drains about 60 Arts from your whole team; taunts do not stop either. Cyclops has 100% CRI rate. Kill them quickly; Burn and Blind speed this up a lot. Both kinds also spawn during the boss fight.

Each Roar of Ruin (MAG) can Paralyse and spawns 2 more Grangarrod or Cyclops; kill them before their debuffs pile up. Normal attacks apply a stackable DMG RES DOWN for 40s, so expect 3–4 stacks at a time. It has some CRI RES, so 100% CRI rate will not always crit. 70% HP: permanent DMG UP and Action Speed UP. 30% HP: faster arts gauge and Action Speed UP. At 0% HP it is invulnerable while it charges 5 orbs, then casts Shadow Lightning (MAG, 100% CRI rate): have DMG RES or MAG RES ready. The stage clears once you survive it, even if mobs are still alive.