Volcanic Eruption (COA)

Upon casting this spell, the caster chooses a point they can see.  At this point, a large deep rumbling occurs as a fissure opens up in the earth and magma starts pouring forth.  The magma begins to solidify as more erupts on top of it building a massive volcano, approximately a mile across and half a mile high.  Over the next 2d4 days, the volcano continues to erupt, spewing molten lava, chunks of rock, and poisonous gases.  Any creature within 1 mile of the center of the spell effect is subjected to 18d10 fire damage, 2d10 bludgeoning damage, and must make a CON save or have the poisoned condition per minute due to being splashed and pummeled with lava and subjected to toxic gases.  Anything that is between 1 and 10 miles is subjected to 10d10 fire damage, 1d10 bludgeoning damage, and must make a CON save or have the poisoned condition per hour.  Between 10 and 50 miles, 5d10 fire damage and a CON save or have the poisoned condition is suffered every 12 hours.  From 50 to 100 miles, 1d10 fire damage and a CON save (with advantage) or have the poisoned condition each day.  Anything beyond 100 miles is unaffected.  The eruption will last 2d4 days; on the last day, the eruption stops and the volcano collapses on itself.