Physical form. A palm-sized black sphere veined with a slow, sickly violet light. Voices of the old god wash through it when held. Carved on its surface is a symbol of the World-Tree inverted and broken.

Properties

• Bound Identity. While bound, The Echo cannot be removed from the plane it was attuned on by any known means; attempts to teleport/plane shift it out fail.

• Unassailable. The Echo is immune to being charmed, paralyzed, petrified, frightened, or possessed. It is immune to all damage and all conditions. It cannot be targeted by spells, magical effects, class features, or items that attempt to restrain, move, destroy, block, dispel, disable, alter, or steal it. Any such attempt fails as though the caster had rolled a natural 1. This includes, but is not limited to: dispel magic, counterspell, antimagic field, banishment, plane shift, teleportation circle, wish, mending, teleport, trap the soul, imprisonment, soul cage, and godlike interventions that replicate those effects.

• Absolute Invocation. While performing the 24-hour attunement ritual the Echo projects an Obliviating Field which prevents any effect from ending the ritual short or changing the pact once begun. The field is visible as a ring of grey fog around the ritual site with a radius of 1 mile; no divination, teleportation, planar travel, or magical cancellation can alter the ritual’s progress while that ring persists.

• Cabalistic Debt. At the moment the pact completes, the pactbearer permanently loses an aspect of self determined by the DM (examples: a lifelong memory, the ability to feel joy, their name from the minds of others, their soul’s tie to their deity). This loss is irreversible. This is mechanical: it cannot be restored by greater restoration, wish, resurrection, true resurrection, or divine intervention. The only recorded way to reclaim such a loss is through rewriting the cosmos — which the Echo achieves when it detonates.

Activation (the Explosion)

• Trigger. After the 24-hour ritual completes the pactbearer may choose any moment (a single action) to ignite the Echo; igniting requires the pactbearer to speak the final vow. The vow cannot be interrupted once begun; no teleport, no dispel, no counter, no time stop, no time reversal, no timeline diversion (back to the future Ahhhh) can stop the ignition or its result.

• Finality (Mechanical effect). When ignited, Xyryx’s Last Echo detonates in a single instant. The mechanical result is absolute and universal.

•  Reality is unstitched. Every creature, construct, object, and fixed point of the campaign’s material plane (and any planes the DM declares directly tied to that world) is removed from existence. The campaign ends. No attack rolls, saving throws, resistances, immunities, spells, features, or items can prevent this removal. Characters, NPCs, monsters, artifacts, and permanent world features all cease to exist as if they never were. The pact bearer, instead of being removed, is then issekai’d into another campaign

Notes: Disciple of Xyryx. The attunement requires the users to perform the Final Communion. The bearer surrounds the Echo with a circle of salted blood and mirrors, carves the Three Inversions of Life into their flesh, and recites a Litany in Reverse until their shadow swallows them whole, Banishment, Negation