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Us is an Intellect Devourer and Attached Follower met during the Prologue of Baldur's Gate 3. It can be found aboard the Nautiloid, trapped inside the head of an elf named Myrnath.
Events of Baldur's Gate 3
Prologue
Us can be found trapped inside the head of Myrnath, who is strapped to a chair with the top of his skull removed, in the second room aboard the Nautiloid. Passing an ability check results in freeing it. When freed, it will initially start with the Newborn condition: temporarily lowering its max HP to 11 and its AC to 7. This only lasts a few turns, however.
If also passing the Dexterity ability check "Mutilate the brain.", Us will end up Lobotomised, reducing their Intelligence from 12 to 8, and reducing movement from 9 m / 30 ft to 6 m / 20 ft. This condition is permanent and cuts Us from the rest of the hive mind, allowing to attack other Intellect Devourers on the nautiloid without turning Us hostile. If failing the dexterity check, Us will flee instead, turning it and all other Intellect Devourers hostile. The Dark Urge will have 
Advantage SPLIT-SPLATTER! on this Dexterity check.
Once freed, Us will urge to head to the Helm Room. Options to either tell Us to go away, to attack it, or to ask it to join the party will be present. Us will agree if asked to join.
Us will disappear after the crash.
Act Two
If Us survives the Prologue it can later be found in the Morgue within the Mind Flayer Colony. It has been labelled an aberrant and as a result is caged. If freeing it, 
Summon Us will allow to get Us as an ally once per short rest.
As a summon, Us has an increased 55 hit points, and resistances to physical and Necrotic damage. Us' appearance changes also; its veins becomes more pronounced and it gains an overall more pale appearance, with a green glow on its underside. Its bonelike spines protrude more prominently, and its tendrils gain thorn-like protrusions.
If lobotomized it will keep his lobotomized malus.
After leaving the Mind Flayer Colony Us will remain with the party. It mentions that it will appear as a "kitty" to anyone besides the party.
Attacks and abilities
Melee: 1.5 m / 5 ft 
Range: 18 m / 60 ft
Recharge: Per turn Related items
Gallery
Us' basic intellect devourer model
Summon Us
Notes
- Us is one of the few characters with multiple voice actors.
- When entering the Helm Room of the Nautiloid, the Mind Flayer there will order them to connect the transponder. Should Us be the only one to enter the room, the mind flayer will have specific dialogue to order Us to find a thrall instead.
- Us is a completely independent type of summon. It can be used simultaneously with any other summon such as Find Familiar or Ranger's Companion.
External links
Us on the Forgotten Realms Wiki