Tunnel Child

Description. Malevolent child-like entities that haunt riverbanks and underground tunnels. They lure unsuspecting children with mimicry and false promises, transforming into feral hunters once their prey enters their subterranean domain. These creatures are the result of ancient curses and dark magic that preys upon innocence itself.

The Curse's Origin. Tunnel Children are not born - they are made. Centuries ago, a powerful fey lord was betrayed by a human child, a young prince who broke a promise of sanctuary. In vengeance, the fey lord cursed the child's bloodline: 'Your descendants shall become what you feared in me, and they shall prey upon the innocent as you preyed upon my trust.' The curse spread beyond the original bloodline. Now, any child who dies in certain ways—lost in tunnels, drowned in underground rivers, abandoned in the dark—may rise as a Tunnel Child. The transformation takes three days. During that time, the child's body is cold but not dead, suspended in a cocoon of shadow. When they emerge, they remember nothing of their mortal life.

Territorial Boundaries. Each Tunnel Child claims a specific territory, usually defined by natural barriers: Within their territory, Tunnel Children are nearly omniscient. They know every tunnel, every hiding place, every shadow. They can sense when someone enters and exactly where that person is.

*Rivers and streams (they cannot cross running water)
*Bridge thresholds (old bridges carved with protective runes block them)
*Sunlight lines (areas where natural light penetrates)
*Salt circles (if properly laid)
*Iron fence lines (cold iron burns them)

The Luring Process. 

1. Tunnel Children are patient predators. Their hunting follows a specific pattern.
2. IDENTIFICATION: The Child identifies a target—usually a mortal child between 6 and 12 years old. Adults are rarely targeted (too suspicious, too hard to lure).
3. FIRST CONTACT: Appearing as a friendly child, the Tunnel Child makes friends with the target over days or weeks. It plays games, tells stories, creates a bond.
4. THE INVITATION: Eventually, the Tunnel Child invites its 'friend' to visit their 'secret place'—always just across a territorial boundary. 'My parents say I can't play on that side of the river, but YOU could come to MY side!' 
5. THE CROSSING: Once the target crosses the boundary, they are in the Tunnel Child's power. The Child transforms, revealing its true form.
6. THE FEEDING: What happens next is not pleasant to describe. The Tunnel Child feeds on fear first, then flesh. The process can take hours.

Protection and Prevention. 

1. NEVER LET CHILDREN PLAY NEAR TUNNEL ENTRANCES ALONE: The most effective prevention. 
2. IRON TOKENS: Cold iron amulets make a child 'invisible' to Tunnel Children. The Watch distributes these in high-risk areas.
3. THE OLD RHYMES: 'Cross no stream at a stranger's request / Stay in the light, it's always best / If a child has no shadow, run away fast / Or your days among the living won't last.'
4. SALT BARRIERS: Salt lines at tunnel entrances prevent Tunnel Children from emerging. Must be renewed after rain.
5. BRIDGE WARDENS: The ancient bridges have carved runes that block Tunnel Children. The Stonemasons' Guild maintains these, though few remember why.

Enter a description of your monster's lair here.

Lair Actions

On initiative count # (losing initiative ties), the [monster name] takes a lair action to cause one of the following effects; the [monster name] can’t use the same effect two rounds in a row:

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Regional Effects

The region containing a legendary [monster name]’s lair is [enter the effect description], which creates one or more of the following effects:

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If the [monster name] dies, these effects fade over the course of #d# days.