Eternal Winter (Spell)

The eternal winter spell is a spell from T.S. Lowther's Akrana setting, included here for use by cultists of Vydhrar.

Effect: You invoke the power of purest winter within a specific area. There are two possible uses for this spell, granting either immediate or long-term effects.

If you cast this spell using 1 action, choose a point within range. Each creature of your choice in a 200-foot-radius centred on that point must make a Constitution saving throw. On a failed save, a creature takes 30d6 cold damage and has their movement speed reduced to 5 feet for 1d6 rounds. On a success, a creature takes half as much damage and is not slowed.

If you cast this spell over 8 hours, you inflict a freezing winter upon the land around you. The area within 5 miles of you is subjected to an especially fierce winter that lasts for an entire year. Creatures and plants not adapted to cold climates die out, and a famine grips the land.

If you cast this spell in the same place every day for a year using the 8 hour effect, the area effected increases by 5 miles each time you do so, and once a full year is past, the effect becomes permanent across a 1,825 mile radius area. This area is subjected to an eternal winter until this magic is dispelled.