Necrodeath aura. Each creature that starts its turn within 25 ft of Osterneth must make a dc 20 Constitution saving throw or take 20 (4d10) necrotic damage, half as much on a successful save.
Legendary Resistance (3/Day). If Osterneth fails a saving throw, she can choose to succeed instead.
Rejuvenation. If she has a phylactery, the destroyed Osterneth gains a new body in 1d10 days, regaining all her hit points and becoming active again. The new body appears within 5 feet of the phylactery.
Spellcasting. Osterneth is an 20th-level spellcaster. Her spellcasting ability is Intelligence (spell save DC 24, +16 to hit with spell attacks). Osterneth has the following wizard spells prepared:
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Cantrips (at will): mage hand, prestidigitation, ray of frost
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1st level (4 slots): detect magic, magic missile, shield, thunderwave, cause fear
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2nd level (3 slots): detect thoughts, invisibility, Melf’s acid arrow, mirror image
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3rd level (3 slots): animate dead, counterspell, dispel magic, fireball
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4th level (3 slots): blight, dimension door, confusion
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5th level (3 slots): cloudkill, scrying
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6th level (2 slot): disintegrate, globe of invulnerability, chain lightning
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7th level (2 slot): finger of death, plane shift, forcecage
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8th level (1 slot): dominate monster, power word stun
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9th level (1 slot): power word kill
Turn Resistance. Osterneth has advantage on saving throws against any effect that turns undead.
Heart of Vecna. When Osterneth kills a creature that isn't undead they regain 50 (10d10) hit points.
Paralyzing Touch. Melee Spell Attack: +6 to hit, reach 5 ft., one creature. Hit: 10 (3d6) cold damage. The target must succeed on a DC 20 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Osterneth can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time, and only at the end of another creature’s turn. Osterneth regains spent legendary actions at the start of her turn.
Cantrip. Osterneth casts a cantrip.
Paralyzing Touch (Costs 2 Actions). Osterneth uses her Paralyzing Touch.
Frightening Gaze (Costs 2 Actions). Osterneth fixes her gaze on one creature she can see within 10 feet of her. The target must succeed on a DC 20 Wisdom saving throw against this magic or become frightened for 1 minute. The frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a target’s saving throw is successful or the effect ends for it, the target is immune to Osterneth’s gaze for the next 24 hours.
Disrupt Life (Costs 3 Actions). Each non-undead creature within 20 feet of Osterneth must make a DC 20 Constitution saving throw against this magic, taking 21 (6d6) necrotic damage on a failed save, or half as much damage on a successful one.
Description
KNOWN AS THE SUPREME SEED OF DARKNESS and the Heart of the Whispered One, Osterneth is Vecna’s mightiest servant. Osterneth is tasked with subverting governments, corrupting good people, and spearheading Vecna’s takeover of the world. In public, Osterneth appears as a seductive, aristocratic human female in her late twenties with dark hair and bronze skin. Her look of demure gentility is emphasized by a rich wardrobe and a charming smile that melts men’s hearts. Claiming nobility from a distant land, Osterneth uses her guile and charisma to gain favor among the scions of high society. With their interest peaked, the Heart of the Whispered One then seduces the world’s greatest leaders, bringing them willingly into the worship of Vecna. In actuality, Osterneth is an ancient lich from a kingdom lost to memory; her true form is a fleshless skeleton of bronzed bones inlaid with soul gems. Within the empty cavity of her chest pulses the heart of Vecna, a shriveled relic preserved from the desiccated remains of Vecna’s original body. The eyes of Osterneth’s naked skull blaze with a prismatic radiance that creates a powerful glamour effect, hiding her true appearance from all but her most trusted servants.
Osterneth is a beautiful, charming noblewoman educated in the arcane arts. She rarely speaks of her past, but claims descent from a distant family of aristocrats in a far-off kingdom. Osterneth is very evasive when pressed for details of her past. A veil of mystery surrounds her, and some suspect she is more than she appears. Osterneth’s interest in magic is focused on the necromantic arts, though she feigns only mild interest. The disappearances of several people close to her has led to suspicion. Some claim she is involved in a cult of some kind.
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