The only word I found is descendant but this is often used for people, and I want to use the word for objects. Is there an adjective or alternative I can use if I want to say sent down, brought down as an adjective? It seems the word descended does not exist.
OP shouldn't worry about the fact that descendant is often used of people. That Wikipedia disambiguation page lists several alternatives, of which the last two may match OP's context.
Google gives a lot of hits for "a descendant class", few of which involve people.
Plus, as Bill comments, a descended [testicle/larynx/god/etc.] is perfectly normal English.
For OP's context (things which have been sent/brought down), perhaps lowered would suit.
The semantic differences there are mainly that a descendant normally derives from a "parent". Things which are descended usually got there by themselves (or by accident), whereas if something is lowered, this normally implies that someone (or something) actively caused it to go down.
We don't really have OP's full context, but as Andrew comments below, floored sometimes works. As do felled, downcast, saddened, ousted, humbled, in various related contexts.