My players just started the Valley of the Brain Collectors. So far they have consistently had six players, sometimes seven, which means they are a little lower level entering the adventure at level 8 instead of 10. Two of my players, my kids aged 12 and 9, I have stopped from playing this adventure because of the horror nature of it (and the next one due to the adult themes) but they will rejoin the party again for the Divinity Drive (until them I am running my kids through the original Expedition to the Barrier peaks on alternate weeks). What this means is that the party is now only 4 characters strong and is under levelled which makes every fight dangerous until they catch up. These torturer robots drained a lot of their resources, more than I expected. No deaths, but much harder than they (or I) guessed. Here is the 5e version of the torture bots.
Small Construct (robot), neutral
Armour Class 17 (reinforced skymetal plating and shield)
Hit Points 142/40 (15d10 + 60)
Speed fly 40 ft.
Initiative Speed +7
STR 8 (-1) DEX 21 (+5) CON 18 (+4)
INT 10 (+0) WIS 15 (+3) CHA 3 (-4)
Skills Medicine +6
Damage Resistances bludgeoning, piercing, and slashing from nonmagical weapons that aren’t adamantine.
Damage Immunities force, necrotic, poison, and psychic
Damage Vulnerabilities lightening
Condition Immunities charmed, frightened, paralyses, petrified, poisoned, stunned
Senses Darkvision 60 ft., passive Perception 13
Challenge 8 (3,900)
Gift of the Machine God. As a creature of technology a riot suppressor gains many damage and condition residences and immunities but they are also susceptible to lighting attacks.
Agile. A torturer robot adds its Dexterity modifier to its damage rolls in place of its Strength modifier when using its rotating blades attack.
Force Field. A torture bot is sheathed in a thin layer of shimmering energy that grants it 40 bonus hit points. All damage dealt to a torture bot with an active force field is reduced from these hit points first. As long as the force field is active, the torture bot is immune to critical hits and loses its vulnerabilities. A torture bot’s force field re-ignites every round on the harvester’s turn. If an attacker gains a critical hit and does enough damage to overwhelm the shield (that is, do 40 or more damage in one attack) it is instead destroyed and cannot be used again until repaired. If an EMP weapons does any damage to the shield the damage is ignored by the shield is deactivated for 1 minute.
Interrogate. As an action, the torturer robot can attempt a Medicine check to deal a level of exhaustion to an adjacent, helpless target. A successful Constitution saving throw with a DC equal to the robot’s Medicine check result negates this damage.
Nanosurgeon. As an action, a torturer robot can inject purpose-programmed nanites into a target as a melee attack. The nanites produce one of the following effects or conditions (CL 10th, where applicable): cure wounds, lesser restoration, neutralize poison, remove disease, exhaustion, poisoned for 1d4 rounds, or paralyzed (nauseated targets only, for remainder of original duration). If the victim succeeds at a DC 17 Constitution saving throw these effects are negated. The torturer robot carries 5 uses of nanites, and it constructs replacements at a rate of 1 dose per hour.
Surgical Lasers. The torturer robot’s surgical lasers have a range of 50 feet with no range increment, and threaten a critical hit on a 19 or 20. Lasers pass through transparent creatures and objects without causing harm (including force fields, force effects, and invisible creatures; it can pass through glass, but the glass takes damage), and can strike targets behind them normally. Fog, smoke, and other clouds provide cover in addition to concealment from laser attacks.
Multiattack. The torture robot makes four rotating blade attacks or two surgical laser attacks
Rotating Blade. Melee Weapon Attack: +7 to hit, reach 5 ft., one target.
Hit: 11 (2d6 +5) slashing damage.
Surgical Laser. Ranged Weapon Attack: +7 to hit, range 50 ft., one target.
Hit: 11 (2d6 +5) radiant damage.
Spinning blades, long needles, and crystal-tipped rods stud the surface of this hovering metallic sphere. The robots will babble in gothic to the creatures they attack – “where is the princess?”, “where are the plans?” etc.