Innate Spellcasting. The Servant's innate spellcasting ability is Charisma. It can innately cast the following spells (spell save DC 15), requiring no material components:
At will: alter self, false life, levitate (self only), mage armor (self only), silent image
1/day each: feeblemind, finger of death, plane shift
Spellcasting. The Servant is a 17th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 15, +7 to hit with spell attacks). It regains its expended spell slots when it finishes a short or long rest. It knows the following warlock spells:
Cantrips (at will): eldritch blast, fire bolt, friends, mage hand, minor illusion, prestidigitation, shocking grasp
1st–5th level (6 5th-level slots): banishment, burning hands, flame strike, hellish rebuke, magic circle, scorching ray, scrying, stinking cloud, suggestion, wall of fire
Dark One’s Own Luck - 2 Uses (Recharges after a Short or Long Rest). When the Servant makes an ability check or saving throw, it can add a d10 to the roll. It can do this after the roll is made but before any of the roll’s effects occur.
Failed Prides Corruption. When the Servant hits 0 health, their fiendish patron twists and transforms their body, renewing and changing it. The Servant's health returns to max, and they gain a fly speed of 50ft. As their form becomes non corporal, they gain resistance to all damage except psychic, radiant, and necrotic. Inflicting wounds to others soothes their twisted form; at the end of their turn the Servant regains 1/4 in health that they inflicted in damage this round.
Hell's Call (Rapier). Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 5 (1d8) piercing damage plus 10 (3d6) fire damage.
The Servant 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. The vampire regains spent legendary actions at the start of its turn.
Stride. The vampire moves up to its speed without provoking opportunity attacks.
Hell's Call. The Servant makes one attack with Hell's Call.
Faithful Servants. (Two actions) The servant summons 2 additional minions from her legion (10 minions present on site). The minions are summoned through magical means but do not appear magically. If there is not physically way to enter, the minions will spend their turn trying to remove the barrier to follow the Servant's command. The minions act on their own turn in initiative and have the Thug stat block.
If the Servant's Mythic trait is active, they can use the options below as legendary actions, as long as he hasn't taken radiant damage this round.
Pull of the Hell's. (Costs 3 Actions). The servant reaches to grab a foe (DC 17 Grapple) and with their touch pulls the creatures life force to feed the Hell's where they draw their power. The creature makes a DC19 con saving throw, or takes 72 (8d10) necrotic damage, or half on a successful save, as their soul is pulled to hell.