Justice of the Wyrm King

Dragon Magic (DM)Supplementals (3.5)
School
Abjuration
Casting Time
1 swift action
Components
V, S
Range
Personal
Target
The caster
Duration
5 rounds
Saving Throw
None (harmless)
Spell Resistance
No (harmless)

Spines of brilliant yellow light burst outward from your body, giving the impression that you are covered in glowing spikes.
You create a field of arcane force around your body that deals retaliatory damage to your attackers.
While this spell is active, any creature striking you with a nonreach melee weapon takes 4d6 points of damage.
As part of the casting of this spell, if you are a sorcerer you can sacrifice one additional sorcerer spell slot of up to 9th level; this increases the damage dealt by 2 points for every level of the sacrificed slot.
For example, if you use a 7th-level spell slot to cast justice of the wyrm king and sacrifice a 5th-level spell slot to augment it, you deal 4d6+10 points of damage to your attackers.