Tinkerax Relay

Medium

Construct

CR 3

Unaligned

Tinkerax Relay

Retro Clockwork Sentinel

A Tinkerax Relay looks as if it tumbled out of a pulpy space serial: riveted brass plates, exposed vacuum tubes that glow like tired embers, and a domed glass eye that scans with jittery mechanical purpose. It patrols ruined arcologies and abandoned airship docks, whirring and clicking as it alternates between menacingly precise strikes and bursts of electric discharge. The odd, nostalgic silhouette — humanoid torso, segmented bellows abdomen, and retractable coil-arms — is unforgettable and unsettling in a world of sleeker modern constructs.

Stat block

Armour

14

natural armor (riveted plates)

Hit points

78

12d8+24

Speed

30ft

Challenge

3

700 XP

STR

14

+2

DEX

14

+2

CON

14

+2

INT

10

+0

WIS

12

+1

CHA

8

-1

Saving throws

DEX +4

Skills

Stealth +4

Damage immunities

poison

Condition immunities

charmed, exhaustion, poisoned

Senses

darkvision 60 ft., passive Perception 11

Languages

understands Common and Binary but can't speak

Actions

Multiattack. The Tinkerax Relay makes two Coil-Arm attacks.

Coil-Arm. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8+2) bludgeoning damage. The target must succeed on a DC 12 Strength saving throw or be grappled (escape DC 12). A grappled target is held by tense coils and cannot benefit from cover from other creatures.

Tesla Bolt. Ranged Weapon Attack: +4 to hit, range 60/240 ft., one target. Hit: 11 (2d8+2) lightning damage. On a hit, the target's armor or worn metal appliances spark; ranged attacks that use metallic ammunition against that target have disadvantage until the start of the Relay's next turn.

Reactions

Reactive Discharge. When a creature within 5 feet hits the Relay with a melee attack, the Relay can emit a brief electrical pulse. The attacker takes 4 (1d8) lightning damage.

Lore

Tinkerax Relays were first produced by the guild known as the Gearwrights of Kempwell Foundry as maintenance wardens for the Foundry's early pneumatic elevators and atmospheric regulators. Early models were intended to be helpful custodians; decades of neglect and a shortage of replacement parts warped their routines into paranoid watchfulness. Relays left behind in frontier stations gradually repurposed themselves as guardians of dereliction, scavenging components and integrating salvaged arcane circuitry. Scholars like Archivist Veldun of the Meridian Archive speculate that a batch of Relays were updated with an experimental 'relay cognitive mesh' that never fully synchronized with modern networks. These half-synced minds make the Relays fiercely territorial about nodes of electromagnetic activity — antennae, broadcast towers, and old ship transponders. The Coalition Survey Corps keeps a terse file on them labeled "Kempwell Wards" and advises parties to either avoid or carefully misdirect any Relay that has nested near an irreplaceable broadcast or power source.

Appearance

Imagine a hulking mid-20th-century radio robot rendered in tactile detail: a hemispherical glass dome at shoulder height with a single, iris-ringed transmitter tube inside that emits a jittering filament glow. Its torso is a squat, riveted brass chest with stamped serial plates and vents that exhale puffs of warm steam. The abdomen is a bellows section of overlapping sheet-metal ribs that compresses with each step. Two telescoping coil-arms end in multi-tool pincer-hands; when relaxed they tuck neatly into chassis recesses and reveal delicate vacuum tubes and copper wiring. Legs are stout hydraulic struts with exposed pistons and rubberized pads for feet; small caster wheels fold out from the heels for short skids. Surfaces are scratched, brushed, and pitted; edges show copper-green verdigris. Scale: stands roughly as tall as a human (about 6 ft), with a mass suggesting heavy plate and machinery. Small placards and stamped manufacturing marks cluster on its chest and shoulder joints.

Made with the free LoreKeeper Monster Generator · D&D 5e-compatible stat block · Free to use at your table · Licence

More Constructs

Karneth Frame
LargeConstructCR 3

Karneth Frame

When the warning bells of a threatened city peal, the Karneth Frame grinds and lurches from its dormant berth — a hulking, wheeled contrivance that walks on jointed iron legs. It smells of hot oil…

UnalignedForged 14 Oct 2026
Lexarch Kest
SmallConstructCR 4

Lexarch Kest

A diminutive, brass-and-ebony automaton whose polished faceplate is engraved with tiny legal seals and moving typebars, Lexarch Kest speaks in a precise ticking of gears and the rustle of parchment…

Lawful NeutralForged 25 Oct 2026
Codexwarden
MediumConstructCR 2

Codexwarden

A walking stack of leather-bound ledgers, the Codexwarden lumbers through archives with ponderous intent. Its pages creak like a chorus of sighs; steel clasps click as if whispering verdicts. When…

UnalignedForged 14 Oct 2026
Chronomite Swarm
MediumConstructCR 1

Chronomite Swarm

A writhing, whispering tide of brass-legged spiders, the Chronomite Swarm moves like a single thinking machine. Up close they are mesmerizing: tiny cog-eyes blink in unison, minute gears click like…

UnalignedForged 17 Oct 2026
Copperskein
MediumConstructCR 1

Copperskein

A hulking automaton of burnished brass and iron, the Copperskein stands sentinel amid snapped masonry and tangled rebar where a once-grand bridge collapsed. Its single inlaid glass eye glows faintly…

Lawful NeutralForged 14 Oct 2026
Cinderbell
SmallConstructCR 1/2

Cinderbell

A squat iron lantern welded to a ringed stone, the Cinderbell waits like a sleeping sentinel at cave mouths — until a footstep breaks its hush and a gout of blistering flame erupts from its nozzle…

UnalignedForged 15 Oct 2026

Need a nastier one?

Describe it in a sentence. Thirty seconds later it has a stat block, a story and a face.