More suggestions:
Modify
Wall of Stone (Wizard Protection spell) with some creative reinterpretation. The spell creates a wall on two squares. As it has 2 Body Points and 6 Defense, it sounds like it would hurt if it were created on one or two (adjacent) monsters. A monster defends by attacking the wall. Each white shield rolled in the defense of the wall that wasn't cancelled by skulls from the monster's attack count as a Body Point of damage to the monster. If the 1-BP section isn't destroyed and the monster survives, it must move off of the square on Zargon's turn.
Combine the Wand of Magic, Spell Ring, Time Stop (Elf spell) and any damaging spell, such as Fire of Wrath. First, store two damaging spells in the Spell Ring. Then, cast one on a monster. Next, use the Wand of Magic to cast Time Stop. Finally, cast the second damaging spell. Two monsters damaged in the same turn is equivalent to a 2-square area of effect. I'd gift the Wizard with one part at a time, and let him discover the process somehow.
If you don't want to mess with
Time Stop--an Elf spell--for the Wizard in the method above, subtitute
Future Sight (Wizard Protection spell). You'll need to cheeze the meaning of a reroll of an attack to include a second, seperate attack with a spell (the power of artifacts magically bends the limitation). That spell will need to have an attack roll, however. Double Genies or (4) Arrows of Night in the Spell Ring should impress him.
2nd on checking out Chaos Spell options, but make sure there is a penalty for using the Dark Side, such as losing a Mind Point or checking against a
Command Chaos spell effect on Zargon's turn.
Finally, I once worked up area of effect as a powing up of the Elemental spell groups. There's way more detail there than you would want, but maybe you could adapt something from there, such as the boosted Ball of Flame spell (inflicts 1 BP to a figure and each adjacent figure). Here's the
link.