The doppelganger monster 5e allows us to obtain three types traits, two types actions, and several attributes. This is how you can use the dnd5e monster. You can read the article to learn more.

Traits

These traits are Shapechanger, Ambusher and Surprise Attack. We’ve detailed explained each of these traits. So let’s get started.

Shapechanger: The 5e Doppelganger is able to use this trait to change its form into either a small or a large Humanoid. Or back to its original form. All of its statistics are nearly identical, except for its normal size. It does not transform any equipment it is wearing or carrying. It will return to its original form when it dies.

Ambusher: The d&d Doppelganger is able to gain an advantage in its first round, as it can use attack rolls against any creature that it has not surprised.

Surprise AttackSuppose that the doppelganger monster is surprised by a creature, and then hits it with an attack during the first round. The target can take an additional 10 (3d6) damage as a result of an attack.

Actions

Multiattack: The d&d Doppelganger 5e has the ability to make two melee strikes, such as slam or Read Thoughts. Below are the images.

SlamThis monster can use the slam action to make a Melee Weapon Attack. It is +6 to hit, can reach 5 feet, and one target. Hit: 7 (1d6+4) bludgeoning.

See Thoughts: The d&d 5e Doppelganger Monster is able to magically interpret any creature’s surface thoughts within 60 feet of it. It can also penetrate barriers but must be at least 3ft. tall, made of dirt or wood, and not more than 2ft. in height, and not less than 2 inches in thickness. As of this while the target is in a specific range, and then the doppelganger can continue reading in its thoughts, as long as this doppelganger’s Concentration isn’t broken (like if concentrating on a spell).

But while reading of this target’s mind, the doppelganger has an advantage on the wisdom (insight) and on the charisma (Deception, Intimidation, and Persuasion) checks which is against to the target.

Attributes Of D&D 5E Doppelganger

AC 14
Alignment Unaligned
CHA 14
CON 14
Challenge Rating 3
DEX 18
HP 52 (8d8+16)
INT 11
Immunities Charmed
Languages Common
Passive Perception 11
Roll 0 1d20 + 6 1d6+4
STR 11
Senses Darkvision 60 Ft.
Size Medium
Skills Insight +3, Deception +6
Speed 30 ft.
Type monstrosity (shapechanger).
WIS 12