While the Pioneer's Guide teaches players how to hide and survive within the Thistle-Thicket, The Sovereign's Back Door reveals that the sanctuary has a leak. This supplement introduces a localized breach where the Sovereign's cold, mechanical logic begins to overwrite the natural (or supernatural) defenses of the Thicket.
Key Narrative PillarsThe Incursion: The Sovereign isn't just attacking; it is "installing" itself. This content details how mechanical protocols manifest in organic spaces.
The Protocol Gap: Identifies a specific vulnerability-the "Back Door"-left behind by the original architects, now being exploited by the Sovereign's reach.
The Clocktower Nexus: Serves as the physical and metaphorical anchor for this content, acting as a bridge between the Pioneer's reality and the Sovereign's domain.
Infection Mechanics: New rules for how "The Sovereignty" attempts to map and claim biological entities.
The "Pipe" Logic: Fast-travel or data-transfer hazards that players must navigate, turning traditional movement into a high-stakes digital/physical gauntlet.
Threat Profiles: Stat blocks for the Sovereign's "Maintenance" units-creatures designed not to kill, but to "reformat" the environment.
As Related Content, this serves as the primary "Inciting Incident" module. It takes a party from passive survival (Pioneer) to active resistance (Sovereign). It provides DMs with the necessary "connective tissue" to escalate the stakes of a campaign from local exploration to a systemic struggle.
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