Weekling

Siphon Life:  When the Weekling successfully hits and does necrotic damage to a creature the creature must make a DC 14 Constitution save. On a failed save the creature takes 1d4 Constitution damage.  A creature will lose 1 hit point per a level for every 2 points of Constitution lost per level. There max hit point will also reduce by the same amount. If a creature hit points go to 0 they will fall unconscious. The hit points can be restored by killing the Weekling or by lesser restoration. The Weekling Constitution modifier is increased by that amount. When the Weekling Constitution is increased by 2 it will gain 4 hit points and its maximum heal will go up by 4 hit points. 

Implant Eggs: When the Weekling succeeds on a bite attack the bit creature must make a DC 10 Strength Check. On a failed save the Weekling will implant 1d4 eggs under the creatures skin. These eggs will hatch in 90 minutes and will burst from the skin doing 1d6 damage per egg. These eggs can be cracked by doing 1d4 damage to them, a DC 18 medicine check or using the greater or lesser restoration spell. The new born Weekling will be able mature at a rate of 12 years per day. They will be able to  attack with in  4 hours of birth and be able to implant more eggs with in 24 hours of being born. 

Senses Life:  Weekling has advantage on perception checks to find hiding or invisible creatures. 

Innate Spellcasting: The Weekling spellcasting ability is wisdom (spell save DC 14 +6 to hit with spell attacks). The Weekling can cast the following spells without material components. 

 (at will): Chill Touch
3/per day: Vampiric Touch 

Bite. 

Action Melee Attack. Melee Weapon Attack: +0 to hit, reach 5 ft., 1 target. Hit: 4 (1d6+ 1) piercing damage.