Winter

is a Tier 8 Cold Path Spell.

The caster causes the entire world to be plunged into an unnatural winter for the duration of this spell - along with the attendant temperature declines, blizzards, reduced daylight, and changes in the flora. The required investment into this spell is substantial; the new season gradually manifests over the first 3 days of maintaining the spell, and only dissipates over several days after the caster stops maintaining the spell. Each hemisphere of the world then returns to the season it would normally have at that time.