Mantle of Spell Resistance. Stryga Broz has advantage against spells.

Helm of Teleportation (3/day). As an action, Stryga Broz can cast the teleport spell.

Spellcasting. The necromancer is a 15th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). The necromancer has the following wizard spells prepared:

Cantrips (at will): chill touch, dancing lights, mage hand, mending, toll the dead

1st level (4 slots): comprehend languages, false life,* mage armor, ray of sickness*, tenser's floating disk

2nd level (3 slots): blindness/deafness,* gentle repose,* ray of enfeeblement,* web

3rd level (3 slots): animate dead,* bestow curse,* intellect fortress, life transference*, summon undead, vampiric touch*

4th level (3 slots): blight,* fabricate, leomund's secret chest, locate creature,

5th level (2 slots): negative energy flood*, wall of force

6th level (1 slot): create undead*, globe of invulnerability, soul cage*

7th level (1 slot): finger of death*

8th level (1 slot): clone*

*Necromancy spell of 1st level or higher

Grim Harvest (1/Turn). When Stryga Broz kills a creature that is neither a construct nor undead with a spell of 1st level or higher, the necromancer regains hit points equal to twice the spell’s level, or three times if it is a necromancy spell.

Withering Touch. Melee Spell Attack: +7 to hit, reach 5 ft., one creature. Hit: 5 (2d4) necrotic damage.

Rod of Absorption (3/day). If a spell targets only Stryga Broz, she can choose to absorb the energy of the spell, nullifying any of its effects.
Stryga can then later use the stored spell level energy to cast spells from her spell list in place of her slots, to a maximum of 5th level. For example, you can use 3 levels stored in the rod as a 3rd-level spell slot.