Aranea

Spider Climb.
The aranea can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check

Change Shape.
An aranea’s natural form is that of a medium sized monstrous spider. It can assume two other forms. The first is a unique small or medium humanoid. An aranea in its humanoid form always assumes the same appearance and traits, much as a lycanthrope would. The second form is a medium spider-humanoid hybrid. In hybrid form, an aranea looks like a medium humanoid at first glance, but a DC 14 Perception check reveals the creature’s fangs and spinnerets. The aranea can wield weapons and also wear armour in this form.

Innate Spellcasting.
The aranea’s innate spell casting ability is Charisma (spell save DC 12)

At will: detect magic, ghost sound, silent image, ghost sound
3/day: mage armour, sleep

Multiattack.
The aranea makes two scimitar attacks.

Bite. (Spider or Hybrid Form Only).
Melee, 5 ft., targets one creature.
Hit: 6 (1d6 + 3) piercing damage and 7 (2d6) poison damage, the the target must make a DC 13 Constitution save, or become poisoned.

Web (Spider or Hybrid Form Only).
Ranged, 50 ft., targets all large or smaller creatures in a 10 ft. area.
All creatures in the targeted area are restrained, and may attempt a DC 13 acrobatics check to get free, or a DC 16 athletics check to break the webbing.

Scimitar. (Humanoid or Hybrid Form Only).
Melee, 5 ft., targets one creature.
Hit: 6 (1d6 + 3) slashing damage.

Poison Dagger. (Humanoid or Hybrid Form Only).
Melee, 5 ft., bonus action, targets one creature.
Hit: 5 (1d4 + 3) piercing damage and 7 (2d6) poison damage, the the target must make a DC 13 Constitution save, or become poisoned.
The aranea may instead make a ranged dagger attack, targeting one creature up to 30 ft. away.

Parry. (Humanoid or Hybrid Form Only).
The aranea adds 3 to its AC against one melee attack that would hit it. To do so, the aranea must see the attacker and be wielding a melee weapon.