Volcanic Eruption

The volcano can be summoned however far the user can see, once summoned everything within a 200 ft radius of the spawn point is affected. on spawn the spell causes 10d20 fire damage to anyone within 50ft of the point of spawn and dealing an additional 1d4 fire damage unless successful save roll. The spell last for 4 hours. anyone will be affected within a 200ft radius every 50 ft a different cause. All of these can be rolled to save, if rolled save enemies don't take any damage. on a failed save, enemies take full damage. 

below 200ft: 1d4 fire damage 

150ft below: 4d8 fire damage

100ft below: 8d12 fire damage

50ft below: 10d10 fire damage

On point:1d100