Abyssal Anchor Spike
wondrous item (consumable), very rare
A heavy, rune-etched iron spike designed to be driven into reality itself.
Abyssal Anchor
As an action, you hammer the spike into the ground in your space. The spike activates for 1 minute, anchoring the surrounding area.While active:
- Fiends within 60 feet of the spike cannot teleport or travel to another plane.
- Any fiend that starts its turn within 30 feet of the spike takes radiant damage.
- Fiends cannot be summoned within 60 feet of the spike.
Lore
Cassiodora Inayaris Pompellini Xifilius did not begin her career thinking about fiends at all. In fact, the Abyssal Anchor Spike was not originally intended to interact with anything alive, or even particularly animate. It began as an experiment in “localizing metaphysical uncertainty,” a phrase she used when she did not yet have a polite way to say she was tired of reality leaking.
The breakthrough came after a failed planar survey collapsed a minor research site into a brief overlap with the Abyss. The incident was not dramatic in the way bards prefer to describe such things. There was no grand battle, only paperwork, screaming, and the kind of geometry that refuses to remain Euclidean. Cass arrived after containment had already been restored and asked a single question that would define the rest of the project: “Why did it think it was allowed to be here?”Her solution was not hatred, nor even fear. It was irritation given structure. The spike was designed as a way to assert temporary authority over a very specific kind of cosmic trespass, treating fiendish presence not as enemies to be destroyed but as unauthorized variables to be excluded from a controlled experiment. Early versions were overly polite, attempting to negotiate boundaries with entities that interpreted negotiation as optional flavor text. Those prototypes failed in increasingly creative ways, none of which were recorded in full by the surviving assistants.
The finalized spike abandoned courtesy entirely. When driven into the ground, it does not form a barrier so much as it imposes a rule: for a brief moment, the surrounding area behaves as though certain forms of movement were never valid options to begin with. Fiends within range do not feel trapped so much as they realize, with growing frustration, that the concept of “leaving” has become unreasonably difficult to justify to reality itself.
Cass filed it under “corrective infrastructure,” alongside several other devices she insisted were not weapons because they did not require intent to function. In private notes, she summarized its purpose more honestly: “If something insists on being somewhere it shouldn’t, I prefer the universe to develop better opinions about that decision.”
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