What about if you're planning to enchant items, wouldn't a smart wizard like to have a rust monster or three to act as a residium converter?
It's also interesting to see how people suddenly accept the 20 % rule for disenchanting stuff and seem to think that getting 100 % for an item means they earn money!
You do not get more money out of it then you had. The only way to make more money of it is an epic item. And even then, you are still limited by RAW to create only items of up to your level while adventuring will always get you items that are your level or higher!
You are still only recycling, not earning money. And you can only create items of your level or lower,while everything you usually find at your level will be of your level or higher. So you are still losing out the good items, which,if your DM follows the suggestsions of the DMG, will already be tailored for your party.Huh? If the default sale price/disenchant ritual for magic items was 80%, rust monsters would still be a great deal.
NOT downtime. YOu need to have two epic level fights each day to get your milestones to activate the ring.(Well, two skill challenges would work,too, or any combination of these.)You have residuum at near 100% efficiency. Now all you need to do is find an appropriately leveled mage willing to make a higher level item relatively cheaply. This shouldn't pose any major difficulties, as the ritual takes but an hour to cast.
The real thing the rust monster does is make the whole 20% resale price far, far, far more absurd than it already was. In a world with rust monsters, magic item->magic item conversion efficiency approaches 100%.
As for profit making, the income with ring is circa 20k gp/day. That is 1 lower epic tier item/month, and about 2 lvl 30 items/year. Not bad for down time. This is assuming there are no paragon tier/epic tier versions of the rust monster, of course. If there are, the income explodes.
Obviously I am off the mark for even trying to extrapolate, but what I am interested is is not how efficient epic level heroes are at making items thanks to rust monsters, I am wondering if in a world where people use their brains, most wizards interested in making custom magic items out of unwanted ones will have a rust monster-supply so they can use a 100% conversion rate for residium.
That means not "wizards trying to make level appropriate items for epic heroes", that simply means "wizards who make those items the heroes used at heroic level".
But you still cannot create an item that is higher than your level anyway, and you will most likely have items that are higher than your level for the big 3 slots.
There's other issues then just making the items for them to devour and convert. Like can Rust Monsters even be kept in captivity, a lot of animals dont fare well. How many GPs worth of metal must they eat in a day to remain healthy? How much is that metal free cage going to cost to design and maintain? What are you using to slaughter it? How much work is it going to be to secure a breeding pair or too? They digest it, so do they need residuum to stay healthy and if so, how much?Obviously I am off the mark for even trying to extrapolate, but what I am interested is is not how efficient epic level heroes are at making items thanks to rust monsters, I am wondering if in a world where people use their brains, most wizards interested in making custom magic items out of unwanted ones will have a rust monster-supply so they can use a 100% conversion rate for residium".
If the PC's REALLY want to go through all these hoops to figure it out instead of, you know, adventuring, I'm sure they'll make a little bit of profit. They'll probably get more from killing people and looting their stuff then playing rust monster rancher, though.
That said, I now have the idea of a couple dwarves who are going to try to train a rust monster to hunt out metal deposits, like some people do with pigs and truffles.