Ruler's Black Key IV thumbnail
Star rarity lvl 5
Star rarity lvl 5
Star rarity lvl 5
Star rarity lvl 5
Star rarity lvl 5
FIRE
SWORD
FIRE
EXRuler's Black Key IV
hp
HP

33406

atk
ATK

1711

vit
DEF

2111

Skills

Lv. 15/15
Black-Key B. Boon x5

Deal 100% damage to one enemy 5 times and increase your fire damage by 50% for 15 seconds.

Cooldown: 23s
Lv. 15/15
Black-Key Assault x5

Deal 100% damage to one enemy 5 times and increase all allies' critical hit rate by 30% for 15 seconds.

Cooldown: 23s

Abilities

Lv. 15/15
Haste

Skill cooldown time down by 10%.

Lv. 15/15
Ambush

Critical rate up by 20%.

Lv. 15/15
Barrier: Curtain of Darkness Rank 2

Reduce the effect of Burden: Curtain of Darkness.

Statistics

Level 70

HPHP
27354
AttackAttack
1407
DefenseDefense
1733

Level 90 (Max Limit Break)

HPHP
33406
AttackAttack
1711
DefenseDefense
2111

Timed or conditional passives are not included in the stats.

Weapon source

This weapon can be obtained while clearing the story. (hard mode)

Stories

Artificial intelligence: machines people cling to in
pursuit of precision. Used for small roles at first
—conversation, predicting weather—they eventually came to
guide humanity.
That is what I am: an artificial intelligence born to rule over this
country. I have been given countless functionalities to fulfill my
role, including a human-like "heart."
I am a machine programmed to understand human emotion,
though I experience only a close approximation of the real thing;
an imitation of what a human might feel in similar circumstances.
Yet even if it is artificial, I possess a heart—and a will. That is why
I have something I must do, even if I lose my role because of it.