Spellplague

Spellplague is a hostile Aberration character in Baldur's Gate 3 who may appear during the fight Atop the Netherbrain if the party contains a Wizard.

Spellplague
Medium Aberration
Level 12 Wizard Aberration
Stats
Armour Class	18
Hit points	87
Movement speed	9 m (30 ft)
Weight	90 kg (198 lb)
Initiative	+2
Ability scores
STR DEX CON INT WIS CHA 16 (+3) 14 (+2) 14 (+2) 22 (+6) 8 (-1) 8 (-1)
Proficiency bonus	+4
Saving throws	Str +3 Dex +2 Con +2 Int +10 Wis +3 Cha -1
Resistances
Resistant	Cold, Fire, Lightning
Features
Magic Resistance	Advantage on saving throws against spells and other magical effects.
Opportunity Attack	Automatically attack an enemy moving out of your reach.

Gameplay

 Main Hand Attack ()

Normal weapon damage Make a melee attack with your equipped weapon.

 Melee: 1.5 m / 5  ft

 Absorb Intellect ()

1d8 (1~8) hit points

Gobble up a foe's intellect, lowering their Intelligence by 1 per turn and healing your wounds for 5 turns.

 Range: 9 m / 30 ft

Recharge: Short rest

 Magic Missile ()

1d4 + 1 (2~5) Force

Create three darts of magical force, each dealing 1d4 + 1Force damage to its target.

The darts always hit their target, and can each be targeted individually.

 Range: 18 m / 60 ft

 Disintegrate ()

10d6 + 40 (50~100) Force

Shoot a thin green ray from your finger. If the spell reduces the target to 0 hit points, it disintegrates into a crumbly ash.

DEX Save

 Range: 9 m / 30 ft

 Ice Storm ()

2d8 (2~16) Bludgeoning

+

4d6 (4~24) Cold

Impel a storm of hail and ice to crash from the sky, covering the ground and striking all objects and creatures within range, dealing Bludgeoning and Cold damage. It also creates an  Ice surface that lasts 2 turns.

DEX Save

 Range: 18 m / 60 ft

AoE: 6 m / 20 ft (Radius)

 Polymorph ()

Transform a creature into a harmless sheep.

If the sheep's Hit Points drop to 0, the target reverts to its original form with its original Hit Points.

WIS Save

 Range: 18 m / 60 ft

 Counterspell ()

Try to stop a spell being cast.

If it is higher level than the spell slot you used to Counterspell, you must make a check using your spellcasting ability^{[See Notes]} to prevent it. The check's difficulty is equal to 10 plus the level of the spell you are trying to counter.

Notes

• The Spellplague also refers to an important historic phenomenon in the Forgotten Realms setting.