Spatula said:
You don't *actually* metamagic the spell to a 20th level spell, you cast the spell in its normal slot but can apply metamagics with the caveat that the final spell level can't be above 20th. At least that's how I understand it.
Spatuala has the right of it.
A red Wizard memorises his spells for the day and then goes and does the circle thing.
After that he can trick out his spells with the remaining levels from the circle magic that he did not use to raise his caster level.
So if he has prepared a fireball at 3rd level, he can maximise it and empower it. At that point his fireball that he memorised at breakfast before the circle is an 8th level spell coming out of a third level slot. Then he can burn 12 more of his stored levels to make it a 20th level spell and essentially unstoppable. But it still only does a max of 90pts of damage because it is still really a third level spell. In this case spell damage is calculated by the true level of the caster. Its just a very dangerous and unavoidable third level spell.
This is from the red wizard description in the DMG:
"The circle leader may add one of the three listed feats to a spell even if he does not know the feat or the addition of the feat would raise the spell level past the circle leaders normal maximum spell level (maximum spell level 20th)."
Key words here are:
...OR THE ADDITION OF THE FEAT WOULD RAISE THE SPELL LEVEL PAST THE CIRCLE LEADER'S NORMAL MAXIMUM SPELL LEVEL.
This works because the spell that is getting heightened is already prepared.
Red Wizard circle leaders prepare it as a normal spell, then the spell gets pumped up by the magic of the circle rather than pumping it up while it is being prepared (as most wizards do and he woul do normally if he were not a circle leader).
Its just a way for wizards to cast unstopable spells. So yes that finger of death is unstoppable. Think twice before taking on a frikkin red wizard... They are dangerous.
Aaron.