See page 398 of the Creature Codex
Spellcasting. The blood mage is a 10th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). The blood mage has following wizard spells prepared:
Cantrips (at will): Acid Splash, Mage Hand, Mending, Poison Spray, Prestidigitation
1st level (4 slots): Charm Person, False Life, Mage Armor, Magic Middle
2nd level (3 slots): Acid Arrow, Hold Person
3rd level (3 slots): Dispel Magic, Feign Death, Fly, Vampiric Touch
4th level (3 slots): Black tentacles, Blight
5th level (2 slots): Conjure Elemental (blood or water only), Scrying
Dagger. Melee Weapon Attack: +6 to hit, reach 5 ft. or range 20/60, one target. Hit: 5 (1d4 + 3) piercing damage.
Blood Feast (Recharge 5-6). The blood mage drains life-giving blood from nearby creatures. Each creature within 20 feet of the blood mage must succeed on a DC 15 Constitution saving throw, taking 35 (10d6) narcotic damage on a failed save, or half as much damage on a successful one. The blood mage gains temporary hp equal to the single highest amount of narcotic damage dealt. A creature that doesn't have blood is immune to Blood Feast.
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