Carrion Legionnaire

Empowered by the Grave. Necrotic energy gives these undead a supreme level of intellectual capability. The Carrion Legionnaires have advantage on all Intelligence and Wisdom based checks.

Hivemind. All members of the Carrion Legion have Telepathy, and deal their Intelligence Modifier in additional damage when 4 or more are within 120 feet of each other.

Preternatural Capability. The members of the Carrion Legion are immensely powerful, equipped with incredible reflexes. Whenever a Carrion Legionnaire successful damages a creature with an attack roll, they move a distance up to their movement speed. 

Siege Monsters. The Carrion Legionnaires deal double damage to structures and constructs.

Creatures of Negative Energy. When a Carrion Legionnaire would take necrotic damage, they instead heal the amount that would have been dealt.

Conversion Through Death. A Medium sized creature slain by a Carrion Legionnaire rises as a member of the Legion after 1d4 hours, should they be unpreserved or revived.

Spellcasting. The Carrion Legionnaire is a 5th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). The Carrion Legionnaire has following Wizard spells prepared:
Cantrips (at will): Chill Touch, Produce Flame
1st level (3 slots): Absorb Elements, Find Familiar (Skeletal in nature)
2nd level (2 slots): Misty Step, Scorch Ray
3rd level (1 slot): Vampiric Touch

Multiattack.  The Carrion Legion makes five attacks, either five sword swings or five attacks with its bow.

Sword of Imminent Death. Melee Weapon Attack: +11 to hit, reach 5 ft., 1 target. Hit: 11 (1d8 + 7) slashing damage and 9(2d8) necrotic damage. A struck creature must make a DC 18 Constitution Saving Throw or they cannot benefit from any healing until the start of the Carrion Legionnaires next turn.

Legion's Bracken Bow. RangedWeapon Attack: +9 to hit, range 150/600 ft., 1 target. Hit: # (1d8 + 5) piercing damage and 9(2d8) necrotic damage. Upon impact, the arrow places a Hunter's Mark upon the target.

Retaliation. When the Carrion Legionnaire is takes damage from an attack within the range of its weapon, it may make a single attack against the source of the damage as a reaction.