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Related to this question, what forms of damage affect an Unseen Servant?

  1. Physical types: bludgeoning, piercing, slashing.
  2. Magical forms of the physical types.
  3. The other types, some of which are always magical, while others can be magical or mundane in nature:

Acid, Fire, Cold, Poison, Necrotic, Radiant, Lightning, Psychic, Thunder and Force.

  1. Falling damage (a special type of bludgeoning, related to this question).

My musings:

  • As a "mindless" entity, it makes sense a Servant cannot take psychic damage.
  • Acid, Fire, Cold, Lightning, and physical damage hinge on whether the Servant has a "body" or not (see the first link).
  • Poison seems like a no, as the Servant certainly doesn't breathe and has no means of absorbing the poison.
  • Necrotic and Radiant are harder to define, as those damage types are themselves open to interpretation.
  • Thunder seems like a no, as it has no hard body to damage with vibrations and doesn't appear capable of hearing anything.
  • Force seems like a yes.
  • Fall damage is highly dependent on the answer to the second link.
  • Since a Servant cannot move through objects like spectral creatures, it seems unlikely a magical weapon would be any different than a regular weapon.
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The spell description does not indicate any resistances nor any immunities. It takes up some space and is made of force. All it needs to do is take one HP of damage and it drops to 0. How to target it would be situation dependent.

Therefore, all forms of damage cause damage to an Unseen Servant. The only form that is arguably not applicable is psychic damage, as the Unseen Servant is mindless, and no stat is offered for intelligence.

If it were within the blast radius of a fireball, game over.

Insofar as Cold damage is concerned, feeling cold isn't the issue. Cold damage being a damage type means that cold can damage it in terms of game mechanics. (Cold makes metal and glass more brittle ... and when we get to "does a mindless entity feel" we once again find that the rules are silent).

Bludgeoning, Piercing, Slashing. Acid, Fire, Cold, Poison, Necrotic, Radiant, Lightning, Psychic, Thunder and Force.

At least 12 of the 13 apply to it. Whether or not Psychic damage affects the Unseen Servant is a DM ruling.

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No immunities are mentioned in the spell description. However, the Unseen Servant is neither an object or a creature, but instead a shapeless force.

As such, it is immune to most spells, including:

Fireball

Each creature in a 20-foot radius Sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 fire damage on a failed save, or half as much damage on a successful one.

The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

Firebolt

You hurl a mote of fire at a creature or object within range.

Magic Missile

You create three glowing darts of magical force. Each dart hits a creature of your choice that you can see within range.

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  • \$\begingroup\$ I don't agree that it is immune to most spells, as it has 1 hp and will probably be impacted by AoE spells. Yes, Fireball specifies 'creature' and 'object', but RAI seems to suggest anything in the radius of impact should be impacted in some way unless explicitly stated otherwise. That said, I absolutely agree that it couldn't be targeted directly by most spells, since it isn't a creature. That point is a useful addition to the discussion, so +1 \$\endgroup\$
    – Taejang
    Jun 22 at 14:32
  • \$\begingroup\$ @Taejang Objects also have HP, but most spells don't damage them. See Can magical spells damage objects? \$\endgroup\$ Jun 23 at 16:19
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Unseen Servant is not affected by any form of physical attack. It is 100% force with no physical form, so there's nothing there to see, touch or attack. It is a very old spell that dates back to the beginning of D&D. If it had been designed to take damage it would have hit points and an AC, which it doesn't.

Unseen Servant can be Dispelled, or taken down by other magic-nullifying effects, but that's about it.

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    \$\begingroup\$ It has one HP and an AC of 10. PHB p. 284. Please revise your answer to take that into account. \$\endgroup\$ Feb 14 '16 at 0:54

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