I was looking through the Eberron Campaign Setting book and I found a simple method of breaking the Wealth By Level limit. Now, there are already a number of ways to do this. Plus, the level 14 requirement makes it rather slow. However, it is unique in that it is available to any class, from wizard to commoner.
You need 5 things:
- You need to be native to Eberron.
- You need to be human. Being a member of House Cannith is preferable but not required.
- You need to not have taken any feats to get a dragonmark.
- You need to have 15 ranks in any 2 skills... which basically means you need to be a level 12 character.
- You need to have the Heroic Spirit feat.
So, other than a single feat, this could work off a perfectly normal build.
Now, the next step is to enter the Heir of Siberys PrC. This gives you a Siberys dragonmark at level 2. The Siberys Mark of Making lets you cast True Creation once a day as a spell-like ability.
True Creation is an interesting spell that is only available from a single Eberron-specific domain. It allows the caster to permanently (or more properly, instantaneously) conjure physical substances in exchange for 1 XP per 1 GP of the item's cost. However, spell-like abilities do not have XP costs so a True Creation spell-like ability gives you physical substances for free.
That's it. No tricks. Just a perfectly normal build for 12 levels and two levels into a PrC will give you infinite gold. Though, I would advise you not to accidentally conjure so much gold that it buries the entire continent.