Combined with the Archmage High Arcana ability Mastery of Elements, it's not so bad.Yeah, it's entirely possible that the wizard prepares nothing but Fireball.
a. Greater Restoration only gives back XP from level drain/negative levels. Not that it isn't viable, because you could have a vampire servent to help you with such a task. The problem I see is the free XP you're supposedly getting after spending the other half you have left from level loss. A proper DM would enforce a penalty, at the very least minus the crafting XP from your previous XP before level loss.Well, suppose I were to employ the following set of tactics in an overall strategy to just blow the mage and his tower to kingdom come:
a) Establishment of Infinite Crafting XP
First, take controlled level loss. Drop a single level (putting you exactly one half a level backward). Next, spend all but the last 500 of the level's XP making things. Finally, use "Greater Restoration" to return yourself to the highest level you ever held. Rinse and repeat.
b) Construction of the Tsar Bomba
As we have access to virtually unlimited raw materials, we could presume to be able to construct a tower silo as a bomb casing (90 ft. diameter, 280 ft. tall). We could fill the silo with marbles (.008 gold a pop) enchanted with spells such as "Fireball", "Ice Storm", or "Sphere of Ultimate Destruction". Establish the spell trigger as a marble's destruction. This would amount to well in excess of 1 million marbles. Establish a small blast charge (say, gunpowder or alchemist's fire) in the casing to destroy the first few marbles. Let the spells which ensue destroy and thus detonate the remainder of the marbles.
According to my calculations, using "Shocking Grasp" (5d6), this would amount to somewhere around 1.7 quadrillion points of damage. Of course, I would need to use a non-touch attack, but still. That's the LOW end of spell damage. Alternatively, that much magical energy accumulating at a single point could hypothetically result in the construction of a super-epic wild magic surge the likes of which the universe has never seen.
The process of constructing this weapon, by 1 cycle per day, will take approximately 3.4 years. As we have the ability to suspend time indefinitely (within a pocket dimension), this does not pose an issue.
c) Alternate Uses for the Tsar Bomba
If, for some reason, the bomb turns out to not be useful as a weapon, hypothetically the Artificier in our party could use the marbles she created to gain a fundamentally infinite crafting pool and construct something else just as epic.
brought to you by our artificier.

10d6 any damage at epic levels is so bad.Combined with the Archmage High Arcana ability Mastery of Elements, it's not so bad.![]()
...
these being the important details, we went up to the mage's room. instead of the terribly hard climatic battle we were expecting, he pushed a button and teleported away while self destructing the tower.
the wild magic mage didn't take this very well, and broke the dimension lock, tracked the teleport, and followed him.
...
Gate can call in something with HD up to twice your caster level. Solars have 22 HD.Gate-ing in an army of solars comes to mind as my first approach to this 45th-level mage business. Let the summoned monsters do all the fighting for you until he is out of spells.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.