Cairn

At a glance: Bone Titan Host heavy / miniboss · slow walking wall the swarm shelters behind · enormous frontal armour, marrow-node weak points · ribcage reliquary disgorges a packed swarm on death · appears in Deadlane / Scourge-Survivors.

The Scourge does not bury its dead — it spends them again. A Cairn is what a front looks like after months of consumption, stacked upright and made to walk: a Bone Titan Host built not from one conquered megafauna but from all of them, stripped skeletons and battlefield bone lashed into a single towering frame by parasite sinew. It is the locust math of CANON §2 made into a body — every host this swarm ate on this ground, given one last use. Where a Render is what the Scourge makes of a soldier, a Cairn is what it makes of a graveyard.

A Warden gunner sees it before anything else in the wave: a slow grey monument rising out of the breach smoke, taller than the wall, its ribs caged around something that glows. They do not waste the opening volley on it. Everyone who has held a lane knows the same thing — the Cairn is not the threat, the Cairn is the shadow the threat walks in, and the worst moment of the fight is the one right after you finally bring it down.

Behaviour

• Slow, towering, front-of-wave. It leads heavy pushes at a funeral pace and never flanks. Its job is to arrive, not to chase. Swarm units route into its shadow and advance behind its bulk, using it as moving cover from tower fire and ranged defenders.
• A damage sponge, by design. Stacked bone-plate armours the front; it soaks punishment a whole wave’s worth of Rippers would die to. Shooting the frame is mostly wasted ammo — the armour is the dead, and the dead don’t mind being shot.
• Weak points are the marrow. Toxic-green parasite nodes glow at the joints and seams where the frame is lashed together, and a breach core sits deep in the ribcage reliquary. Hit the marrow, not the bone — the correct fight is precision into a slow target while its escort tries to bury you.
• Primary attack: a slow overhead sweep of a fused bone-club limb that shatters cover, barricades, and anything that stood still to line up a shot. Telegraphed and avoidable alone; lethal when the swarm has already pinned your footing.
• On death the reliquary opens. When the frame finally falls, the ribcage splits and disgorges the cluster of dormant smaller hosts packed inside it — a fresh, point-blank swarm dropped onto whoever just killed it. Bring a Cairn down in a corner or in melee and you are buried by its contents; bring it down with range and space and you control the second wave instead.
• Not a relay. A Cairn carries no Choir node and does no coordinating of its own — its bulk and its escort are its whole threat. While its wave thinks as one mind, that is a nearby Chorister or Cantor’s doing (CANON §5–6), not the Cairn’s; sever that node and the Cairn lumbers on feral, still a wall, but a blind and stupid one.
• Killing a Cairn does not cost the Scourge anything it values — it was already dead biomass spent forward (CANON §2). The hive builds another from the next month’s harvest.

Gameplay Read

• A tank-and-trap, not a pressure unit: the encounter is built around how you kill it, not whether you can. The skill check is positioning for the disgorge, plus precision onto the marrow.
• Telegraph: a grey monumental silhouette, far taller and slower than any other heavy; the toxic-green marrow-nodes at its joints and the core glow in its ribcage are the obvious “shoot here” answer against an otherwise dull-bone body.
• Readable death: the ribcage visibly cracks and swings open a beat before the packed swarm spills out — a clear, no-UI tell that the second wave is coming and from exactly where.
• Counter-play has a cost either way: kill it early at range and you eat the disgorge while the main wave is still closing; let it walk and it shields the whole push to your wall before it dies.

Visual Motifs

• A walking tower of fused skeletons — megafauna ribs forming a cage, smaller skulls and stripped human and host dead packed into the frame, bone-pale and weathered, clearly assembled rather than grown.
• Parasite sinew and black chitin lashing the stack together at every joint, threading through eye sockets and marrow channels — the grammar that marks it Scourge and not a mere pile of bone.
• Toxic-green marrow glowing inside the bone at the lashing-points; a brighter breach core buried deep in the ribcage reliquary, half-hidden behind the ribs that cage it.
• The dormant swarm visible packed inside the ribcage — wet shapes folded into the dry frame, the threat you can see before it’s loose.
• One oversized bone-club limb, a femur or tusk-mass fused with chitin; the opposite side a heaving knot of sinew holding the stack upright.

Sprite Brief

• Views: front, side, back.
• Silhouette must read tall, slow, and monumental at lane distance — instantly distinct from the low charging Render, the wide low Rot-Engine, and the walker-framed Graft-Breacher.
• The marrow-nodes and the caged ribcage core are the focal points: the “where do I shoot” answer is the glow inside the bone, not the bone itself.
• Death state: a ribcage-open variant, frame cracked wide with the packed swarm spilling out — the disgorge made readable.
• Back view: the load-bearing sinew knot — the most consumed, softest mass, the reward for flanking.
• Must stay readable in both Deadlane’s lane-top camera and Scourge-Survivors’s close FPS framing.

Prompt Seed

Scourge bone-titan heavy, a towering walking ossuary built from fused stripped skeletons, megafauna ribs caging a glowing breach core, smaller skulls and host dead packed into the frame, parasite sinew and black chitin lashing the bone stack together through eye sockets and marrow channels, toxic-green marrow glowing inside the bone at every joint, one oversized bone-club limb, a dormant swarm visible folded inside the ribcage, slow monumental silhouette, blood and rust and gunmetal, DOOM-like heavy shadows, no neon.

Appears In

• Deadlane — a heavy-wave wall: it tanks tower fire and shields the swarm closing on the line, so a Warden must choose between burning it down early (and eating the disgorge mid-lane) or letting it shepherd the push all the way to the wall. A prioritisation puzzle, not a damage race.
• Scourge-Survivors — a breach-room miniboss for a lone Pyre Purger (Perdition): the room is the trap, because killing the Cairn floods it with the swarm it was carrying; the intended play is to break it from the doorway with room to fall back, not in the open.