Vampiric Druid: As a bonus action, the Skinwalker can shift into the form of a humanoid, beast, or monstrosity it has drunk the blood of in the past 48-hours. It must drink at least one cup of said blood. The Skinwalker retains it Cha, Wis, and Int stats during the shift. If it becomes a beast or monstrosity that cannot speak it cannot cast spells in that form. It gains the hit points, str, con, and dex, scores of that form. When reduced to 0 hit point the Skinwalker reverts to its true form and any extra damage is taken from that form. 

Vampiric Knowledge: The Skinwalker gains the memories of any creature it drinks a cup of blood from so long as the creature has an Intelligence score of 4 or higher. The Skinwalker does not gain any spells from doing this.

Spellcasting: The Skinwalker is a 2nd-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 14, +5 to hit with spell attacks). The Skinwalker has following Wizard spells prepared:
Cantrips (at will): Shocking grasp, Toll the Dead, Minor Illusion
1st level (once per day): Alarm, Cause fear, False life, Thunderwave, Sleep, Gentle Repose

Magic resistance: The Skinwalker is resistant to magic and magical effects. It has advantage on saving throws against magic and magic effects.

Multi-Attack: The Skinwalker makes two attacks with its claws.

Claws (Skinwalker form only): Attack: +5 Hit: 17(4d6+3) slashing. The Skinwalker can choose not to deal damage with the claw attack and instead for the target to make a STR save of 14. If the target fails it is grappled by the Skinwalker.

Bite: The Skinwalker tries to bite its target. Attack:+5 Hit:10(1d6+3) piercing, 1d6 necrotic. The skinwalker drains half a cup of blood from the target on a hit.