Ferronox Sentinel

The creature can take 3 legendary actions per round, choosing from the options below.

The Ferronox Sentinels were forged in the subterranean forges beneath the city of Kurn by a cabal of artifice-priests called the Order of the Rivet. Originally created to guard the Order's vaults and to wrest ore from the molten rock, mercantile disputes and siege politics turned the Sentinels into city-scale weapons. When the forges shut and the priests dispersed, many Sentinels remained active, patrolling deserted industrial ruins where the smell of coal and oil still clings to the walls. Scholars such as Maester Hosk of the Arcanarium of Bryn have argued that Ferronox Sentinels possess a limited collective protocol — a 'circuitus' — that allows them to coordinate repairs and battlefield maneuvers when in proximity to other sentinels or to the Foundry of Kurn. Bandits who loot sentinel-laid ruins tell of one sentinel that bent an iron gate into a cage and then used it as a ram against pursuing brigands; pilgrim songs in nearby hamlets call them 'the Unblinking Husks.' Parties that try to salvage a sentinel's core often find themselves stalked afterwards by smaller repair-constructs that come to reclaim parts.

Imagine a hulking humanoid frame six times the height of a human, plates of riveted iron overlapped like the ribbing of a ship. Large circular rivets sit in concentric rows along its limbs; seams exude faint steam. Exposed pistons and braided power conduits run along its spine and arms, ticking rhythmically. Its head is a faceted iron helm with a central furnace viewport that glows ember-orange; surrounding it are glassy sensory lenses and arcane sigils chased into brass. Articulated hands end in thick grappling fingers and a palm plate that can open to reveal a welding torch or kinetic projector. Surface textures alternate between hammered iron plate, smooth burnished brass trim, and patches of heat-scored steel. Scale: the Sentinel stands tall enough that its shoulder plates clear a standard guildhall doorway; a human in frame reaches roughly to its knee. Small maintenance hatches, soot stains, and drips of oiled hydraulic fluid add industrial detail.