Sources
CR
Type
Size
Alignment
Movement

Trenzia

Tiny Undead, Neutral Evil

Armor Class 13
Hit Points 40 (9d4 + 18)
Speed 0 ft., fly 40 ft. (hover)
STR
1
-5
DEX
17
+3
CON
14
+2
INT
16
+3
WIS
10
+0
CHA
11
+0
Skills Arcana +5, Perception +2
Damage Resistances fire, necrotic, piercing
Damage Immunities lightning, cold, poison
Condition Immunities Charmed, Frightened, Paralyzed, Poisoned, Prone
Senses darkvision 60 ft., passive Perception 12
Languages Common
Challenge 4 (1,100 XP)

Traits

Illumination. Trenzia sheds either dim light in a 15-foot radius, or bright light in a 15-foot radius and dim light for an additional 15 feet. It can switch between the options as an action.

Magic Resistance. Trenzia has advantage on saving throws against spells and other magical effects.

Rejuvenation. If Trenzia is destroyed, it regains all its hit points in 1 hour unless holy water is sprinkled on its remains or a dispel magic or remove curse spell is cast on them.

Spellcasting

Spellcasting. Trenzia is a 5th-level spellcaster. Her spellcasting ability is Intelligence (spell save DC 13, +5 to hit with spell attacks). She requires no somatic or material components to cast its spells. Trenzia has the following wizard spells prepared:

Cantrips (at will): mage hand

1st level (3 slots): magic missile, shield

2nd level (2 slots): blur, flaming sphere

3rd level (1 slot): lightning bolt

Actions

Multiattack. Trenzia uses Lightning Ray twice.

Fire Ray. Ranged Spell Attack: +5 to hit, range 30 ft., one target. Hit:10 (3d6) lightning damage.

Lore

Blazing green flames and mad, echoing laughter surround an undead flameskull. This disembodied skull blasts foes with fiery rays from its eyes and dreadful spells called up from the dark recesses of its memory.