Champion of Usamigaras

Medium Humanoid, Chaotic Neutral

STR
10 (+0)
DEX
14 (+2)
CON
12 (+1)
INT
17 (+3)
WIS
14 (+2)
CHA
15 (+2)
Spellcasting.

The champion casts one of the following spells, using Intelligence as the spellcasting ability (spell save DC 13):

At will: Light, Mage Armor (self only), Mage Hand, Minor Illusion

2/day each: Charm Person, Disguise Self, Silent Image

1/day each: Crown of Madness, Shatter

Actions

Multiattack.

The champion makes two Arcane Burst attacks or makes one Arcane Burst attack and uses Spellcasting.

Arcane Burst.

Melee or Ranged Spell Attack: +5 to hit, reach 5 ft. or range 120 ft., one target. Hit: 8 (1d10 + 3) force damage.

Bonus Actions

Aura of Deception (1/Day).

The champion emits an aura of ghostly illusions that fills a 10-foot-radius sphere centered on itself. While this aura is active, creatures have disadvantage on attack rolls against the champion and any of the champion's allies that are in the aura. The aura moves with the champion and lasts for 1 minute, until the champion has the incapacitated condition, or until the champion uses another bonus action to end the aura.

Find this creature in the encounter builder

Champion of Usamigaras

Source: Quests from the Infinite Staircase, p. 206 - Licenses and attribution