A Magic Anomaly has an innate spell casting ability of 12, and casts spells in an unusual manner. It can cast Chaos Bolt and a weakened Disintegrate at will, but must charge itself with the appropriate amount of magic before it can do so, glowing brightly during the turns it is charging.

At will:

Chaos Bolt

Level: 1
Casting time: 1 Action (charge for 1 round)
Range: 120 feet
Duration: Instantaneous
You hurl an undulating, warbling mass of chaotic energy at one creature in range. Make a ranged spell attack against the target. On a hit, the target takes 2d8 + 1d6 damage. Choose one of the d8s. The number rolled on that die determines the attacks damage type, as shown below.

d8	Damage Type
1	Acid
2	Cold
3	Fire
4	Force
5	Lightning
6	Poison
7	Psychic
8	Thunder

If you roll the same number on both d8s, the chaotic energy leaps from the target to a different creature of your choice within 30 feet of it. Make a new attack roll against the new target, and make a new damage roll, which could cause the chaotic energy to leap again. A creature can be targeted only once by each casting of this spell.

 

Disintegrate (Weakened)

Casting Time: 1 action (Charge for 3 rounds)
Range: 60 feet
Duration: Instantaneous
A thin green ray springs out to a target that you can see within range. The target can be a creature, an object, or a creation of magical force, such as the wall created by wall of force. A creature targeted by this spell must make a Dexterity saving throw. On a failed save, the target takes 4d6 + 10 force damage. If this damage reduces the target to 0 hit points, it is disintegrated. A disintegrated creature and everything it is wearing and carrying, except magic items, are reduced to a pile of fine gray dust. The creature can be restored to life only by means of a true resurrection or a wish spell. This spell automatically disintegrates a Large or smaller nonmagical object or a creation of magical force. If the target is a Huge or larger object or creation of force, this spell disintegrates a 10-foot-cube portion of it. A magic item is unaffected by this spell.

Death Burst: Upon death, the Magic Anomaly explodes in a 10 foot radius. All creatures within this area must make a DC 12 Dex save, taking 2d6 force damage on a failed save and half as much damage on a successful save.
Illumination: The Magic Anomaly sheds bright light in a 10-foot radius and dim light for an additional 10 ft.
Magical Absorption: When hit with a magical item or spell, the Magic Anomaly has a 50% chance of absorbing the magic. Spells grant points equal to the spell level they were cast at, with Cantrips and enchanted items granting 1/2 points. If the Magic Anomaly absorbs 10 points within one encounter, it will shift into an Abomination.
Recharge: After casting a spell, the Magic Anomaly cannot absorb magic for 1d4 rounds.
Magical Structure: Any antimagic effects or dispel cast on on this creature deals damage equal to the caster level of the creature that used the spell.