Memorial Arena eight-clear Crystal milestone

Challenge > Memorial Arena > current weekly boss lineup and challenge-clear rewards.

Before you go

Open Memorial Arena and inspect the current bosses, tiers, and challenge-clear progress.
Choose a boss and tier your team can reliably clear.
Complete the challenge and confirm that the clear registered toward the weekly milestone.
Repeat on an available tier or another boss, tracking the total registered clears.
If team assignments are locked for a boss, plan the remaining teams before committing them.
Once the counter reaches eight clears, open the challenge rewards and claim the 100 Crystals.
Check the reward inventory to confirm the Crystals were received.

Spread clears across bosses and tiers according to the counter; the example clear combinations vary with the lineup.
Treat ranking rewards separately: a lower score can still contribute to challenge-clear progress.

The milestone is available with each weekly Memorial Arena lineup. It requires new clears in that lineup; it is not an unlimited Crystal farm.

Chasing ranking placement before completing the clear milestone: check challenge-clear progress first.
Assuming last week’s boss count or tier plan still applies: inspect the current lineup and counter.
Locking teams into bosses without planning later attempts: review the remaining lineup before finalizing assignments.

Stop when the eight-clear challenge reward is claimed, or when the remaining available tiers exceed what your roster can reliably clear.

Sources & fact checks

Open a guide to find other locations and see what the item is used for.

Recurring weekly rewards

Earn the Memorial Arena challenge-clear Crystal reward by reaching its weekly boss-clear milestone.