Fluxcharger

Large Elemental, Chaotic Neutral

AC: 16

Initiative: +4 (14)

HP: 60 (8d10 + 16)

Speed: 0 ft., fly 60 ft.

STR
15 (+2)
DEX
18 (+4)
CON
15 (+2)
INT
6 (-2)
WIS
10 (+0)
CHA
7 (-2)

Resistances: thunder; bludgeoning, piercing, slashing from nonmagical attacks

Immunities: lightning; poison

Condition Immunities: exhaustion; grappled; paralyzed; petrified; poisoned; prone; restrained; unconscious

Senses: darkvision 60 ft., Passive Perception 10

Languages: Draconic

CR: 7 (XP 2,900; PB +3)

Amplify Lightning.

Whenever a spell that deals lightning damage includes one or more fluxchargers in its area, the spell deals an extra 9 (2d8) lightning damage.

Actions

Multiattack.

The fluxcharger makes two slam attacks or uses Arc Lightning twice.

Slam.

Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage plus 10 (3d6) fire damage.

Arc Lightning.

Ranged Spell Attack: +7 to hit, range 30 ft., one target. Hit: 16 (3d10) lightning damage, and lightning jumps from the target to one creature of the fluxcharger's choice that it can see within 30 feet of the target. That second creature must succeed on a DC 15 Dexterity saving throw or take 13 (3d8) lightning damage. The fluxcharger takes 5 (1d10) force damage after resolving the attack.

Find this creature in the encounter builder

Fluxcharger

Source: Guildmasters' Guide to Ravnica, p. 208 - Licenses and attribution