Apocalypse From The Sky (3.5e Spell)

''Calling on the darkest forces in all existence, this spell rains death and ruin from the sky. It is known to level forests and wipe out cities. So mighty is this spell that even its caster is not safe.''

All creatures and objects in the area are dealt 20d6 damage, which ignores DR and hardness of all kinds. The caster is also subject to the damage.

This spell requires at least one minute's casting to have any effect at all. If used after one minute of casting (or the caster is interrupted), it has an area of 1 mile. Each additional minute above this (up to 10 minutes total) increases this by another mile. Thus, after 1 minute, the radius would be 1 mile, after 2 minutes, 2 miles, etc.

While this spell is being cast, a large, dark beacon forms directly above the caster, marking the sky with black clouds which crackle with purple lightning. This is visible to a distance of 20 miles from the caster.