Three Dooms

Ranged spell
Recharge 16+ after battle
One nearby enemy; chain spell
Charisma + Level vs. PD
2d4 x 10 random energy damage, and you take damage of the same type equal to the unmodified dice roll (2d4, 2d8, or 2d12). (Note that there's no Charisma bonus to damage.)
Half damage, and you still take random energy damage equal to the unmodified dice roll.
7th Level Spell: 
2d8 x 10 damage.
9th Level Spell: 
2d12 x 10 damage.
Chain Spell: 

Each time you make a natural even attack roll, you can attack a different target with the spell.