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Blade's Echo - The "Unexpected Disaster" achievement in the Unexpected Experience achievement can only be obtained until August 5th.

You need to die from the Hellfire Knight's charge attack, but the Overlord-level Hellfire Knights in the field don't use the charge attack pattern.

You must achieve it in the Secret Realm Challenge, which runs until August 5th.

✅Secret Realm Challenge - Stage 4 (Level 80) - 9th Stage (2nd Boss)

The Hellfire Knight appears as a boss in that stage and uses the charge attack pattern.

Choose the Resonator you are most comfortable with to quickly get to the 9th stage.

✅Hellfire Knight's "Charge Attack" Pattern

▲ Just die from the dashing pattern after the red flash while keeping a slight distance!

✅2 Patterns to Watch Out For

▲ The 3 fire orbs are threatening because they suddenly fly in when you are outside the attack range!▲ The fire border is created under the Resonator's feet and is very dangerous because it takes 2-3 ticks of damage!

ℹ️Recommended Echo: Bell-Ringing Turtle

The Bell-Ringing Turtle's shield and Metaphor upgrade are very helpful because they prevent accidental deaths!

Highly recommended because it prevents you from dying from attacks other than the charge attack when there are many stacks of the Melting debuff!

ℹ️Recommended Concerto: Verina

Grace of Life: When receiving a fatal attack, you do not die and create a shield equal to 120% of Verina's attack power.

The above effect is also activated in the Secret Realm, and it is highly recommended because it prevents accidental accidents as well!

▲ Sometimes you can avoid having to try again due to death from attacks that are difficult to avoid!