Flameskull

Blazing green flames and mad, echoing laughter follow a disembodied skull as it patrols its demesne. When the undead flameskull discovers trespassers, it blasts the intruders with fiery rays from its eyes and dreadful spells called up from the dark recesses of its memory. Dark spellcasters fashion flameskulls from the remains of dead wizards. When the ritual is complete, green flames erupt from the skull to complete its ghastly transformation.
Legacy of Life A flameskull only dimly recalls its former life. Though it might speak in its old voice and recount key events from its past, it is but an echo of its former self. However, its undead transformation grants it full access to the magic it wielded in life, letting it cast spells while ignoring the material and somatic components it can no longer employ.
Eternally Bound Intelligent and vigilant, a flameskull serves its creator by protecting a hidden treasure hoard, a secret chamber, or a specific individual. A flameskull carries out the directives given to it when it was created, and it interprets those commands to the letter. A flameskull's master must craft its instructions with care to ensure that the creature carries out its tasks properly.
Wreathed in Flame The fire wreathing a flameskull burns continually, giving off bright light that the creature controls. It uses those flames as a weapon, focusing them to loose them as fiery rays from its eye sockets.
Eldritch Rejuvenation A flameskull's shattered fragments reform unless they are splashed with holy water or subjected to a dispel magic or remove curse spell. If it can no longer fulfill its intended purpose, the re-formed flameskull is beholden to no one and becomes autonomous.
Undead Nature A flameskull doesn't require air, food, drink, or sleep.

Flameskull

Blazing green flames and mad, echoing laughter follow a disembodied skull as it patrols its demesne. When the undead flameskull discovers trespassers, it blasts the intruders with fiery rays from its eyes and dreadful spells called up from the dark recesses of its memory. Dark spellcasters fashion flameskulls from the remains of dead wizards. When the ritual is complete, green flames erupt from the skull to complete its ghastly transformation.

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Armor Class	13
Hit Points	9d4+18
Speed	0 ft.	Fly 40ft.
Strength	1 (-5)
Dexterity	17 (+3)
Constitution	14 (+2)
Intelligence	16 (+3)
Wisdom	10 (+0)
Charisma	11 (+0)
Skills	Arcana d20+5	Perception d20+2
Damage Resistances	Lightning	Necrotic	Piercing
Damage Immunities	Cold	Fire	Poison
Condition Immunities	Charmed	Frightened	Paralyzed
Poisoned
Senses	Darkvision 60ft.	Passive Perception 12
Languages	Common
Challenge	4 (1,100 XP)
Special 1	Illumination	The flameskull sheds either dim light in a 15-foot radius	or bright light in a 15-foot radius
and dim light for an additional15 feet.	It can switch between the options as an action
Special 2	Magic Resistance	The flameskull has an advantage on saving throws against	spells and other magical effects
Special 3	Rejuvenation	If the flameskull is destroyed,	it regains all its hit, points in 1 hour
unless holy water is sprinkled on its remains	or dispel magic or remove curse spell is cast on them
Special 4	Spellcasting	The flameskull is a 5th-level spellcaster.	Its spellcasting ability is Intelligence
(spell save DC 13, d20+5 to hit with spell attacks).	It requires no somatic or	material components to cast its spells.	The flameskull has the following wizard spells prepared:
Spells 1	Cantrip (at will)	Mage hand
Spells 2	1st level (3 slots)	Magic missile	Shield
Spells 3	2nd level (2 slots)	Blur	Flaming sphere
Spells 4	3rd level (1 slot)	Fireball
Action 1	Multiattack	The flameskull uses Fire Ray twice
Action 2	Fire Ray	Ranged Spell Attack	d20+5 to hit
Range 30 ft., one target	Hit 3d6 fire damage