Destrato (3.5e Sacrifice)
From D&D Wiki
The Gate is a source of endless power. For every death in the world, another mote of power swells behind the Gate. After eons, it blazes like the sun itself, a terrible frothing destruction waiting for release. This sacrifice requires 3 rounds of casting, going off at the end of the 3rd round. It's backlash is terrible. And yet it's destructive power is amazing. With Long Range (400 ft + 40 ft/level), you create an explosion of eldritch might which consumes a 60 ft radius, dealing 1d8 force damage per caster level to all targets (maximum 25d8), Reflex for half. In exchange, you are dealt 2d6 Con damage which bypasses all immunities you may have to ability damage, and are dazed for 1 round after casting. If you do not have a Con score, the damage is Cha damage instead.