Contact Ithaqua

8th-level evocation (formula)

Casting Time: 5 hours (5 phases of 1 hour and fails automatically if interrupted when cast as a formula)

Range: Special

Components: V, S, D (5-foot-radius circle carved from ice surrounding primary caster), L (an elevated area in a permanently wintry region, such as a high peak or polar ice cap), SC (4 to 10, who must have Mythos taint or proficiency in History or Yog-Sothothery and chant from text; +1 bonus on non-diagram formula ability checks with 6, +2 with 8, or +3 with 10)

Formula Ability Checks: Intelligence with mason’s tools or Wisdom (Yog-Sothothery) DC 24 (diagram), Intelligence (History) or Wisdom (Yog-Sothothery) DC 24, Intelligence (History) or Wisdom (Yog-Sothothery) DC 24

Formula Backlash: 8d4 psychic damage to primary caster, 8 psychic damage to each secondary caster, one level of exhaustion each

Formula Failure: First-degree insanity or an indefinite madness, magically frightened for 10 days

Duration: 8 hours

You call out to Ithaqua, who can hear you as long as you are on the same plane of existence. Its stage 1 Elder Influence can choose to arrive at any location you can see. If it chooses to appear only far off, only the dread icy winds in his wake might mark his presence. For the duration, Ithaqua remains close enough to communicate at least fleetingly and you and up to ten creatures of your choice have resistance to cold damage. If Ithaqua’s influence was already present on your world, you can coax it to within 500 feet if you succeed on a Wisdom (Yog-Sothothery) check with a DC depending on its current stage: stage 1 (DC 15), stage 2 (DC 20), stage 3 (DC 25), or stage 4 (DC 30). In any case, Ithaqua generally brings at least one gnoph-keh and transforms all willing participants into wendigos. Unwilling participants can avoid becoming wendigos with a successful Charisma saving throw.