Eldritch Storm

Eldritch Storm

[Evocation]
Level: Sorc/Wiz 9
Components: V,S
Range: Medium
Area: Gargantuan
Duration: Instantaneous
Save: Will Half
Spell Resistance: Yes
Description:

Upon invoking this spell, the caster causes the source of all magical energy itself, the Flow, in an area to concentrate into a single point and become semi-material. An instant later, that magical singularity detonates in a swarming, spiralling, expanding mass of Eldritch shards that tear, shred, slice, slash, blast and burn any material caught in the area, dealing 25d6 magical damage. With enough strength of will, and a successful will save, a sentient being can cause some of the storm to wash over themself harmlessly reducing the damage by half.

I like the sounds of this....

The visual for this spell would be the visual for Great Thunderclap, but maybe with some red and green and purple thrown in.