An alternate take on QDA (PleasingFungus).

Base AC 10 (same as PDA, since quicksilver dragons and pearl dragons
have the same AC), but unenchantable. It keeps its MR++.
Don't let qda/hda get duplicate randart props

Following the other dragon armours' lead.
Probably don't let qda get minuses

unfr: makeitem.cc
Reduce QDA to MR+

MR++ was a bit much; it already has a good +0 gimmick.
Export MR+ to a const