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Summon Dimensional Shambler

8th-level conjuration (formula)

Casting Time: 10 minutes (5 phases of 2 minutes when cast as a formula)

Range: 5 feet

Components: V, S, M (any dust or liquid, a knife or similar tool of unalloyed metal), D (a circle exactly the size of your space)

Formula Ability Checks: Intelligence (Arcana) or Wisdom (Yog-Sothothery) DC 22 (diagram), Intelligence (Arcana) or Wisdom (Yog-Sothothery) DC 22, Intelligence (Arcana) or Wisdom (Yog-Sothothery) DC 22

Formula Backlash: 8d4 psychic damage

Formula Failure: Dimensional shambler ignores orders and waits for an opportunity to attack the caster or nearby creatures before departing

Duration: Until task is complete, up to 10 days

You summon a dimensional shambler, which appears just outside the diagram. In order to fit all the proper sigils in the correct arrangement and allow you to stand inside without stepping out accidentally, the circle must be almost big enough for the shambler but not quite; if it’s too large, the shambler can simply appear inside the circle. The purpose of the diagram is to ensure the dimensional shambler can’t enter or appear inside it, so if you didn’t draw the diagram exactly, it may get inside to abduct or attack you. If you don’t get at least a 25 on the diagram ability check, the dimensional shambler can squeeze inside the diagram by succeeding on a DC 15 Dexterity (Acrobatics) check. No dimensional shambler can pass through the diagram created as part of casting this spell while on the same plane of existence. The dimensional shambler always appears 1 minute before the casting is complete and acts as it wills during that time, which might involve attacking or abducting nearby creatures not also in precisely-sized protective circles. It can’t, however, depart the immediate vicinity without a meal to take along to other planes.

Once the spellcasting is complete, you compel the dimensional shambler to carry out one task of your choice. It can ignore the task if it succeeds on a Charisma saving throw, which immediately ends the spell and frees the shambler to act as it will. It generally seeks out a meal before returning to other planes.

Section 15: Copyright Notice

Sandy Petersen’s Cthulhu Mythos, © 2018, Petersen Games; Authors: Sandy Petersen, David N. Ross, James Jacobs, Arthur Petersen, Ian Starcher.