I’ve been hunting brutal black dragons off and on and I’ll give you the practical, “what you’ll actually see” breakdown I use when I go kill them.
First off, the reliable staples are what you should expect every run: dragon bones and black dragonhide show up a lot, and you’ll also get coin stacks. They commonly drop runes — fire runes and chaos runes show up frequently — plus a smattering of low‑to‑mid level ores and bars or basic weapons/armor as filler. Herbs, seeds, and low‑value food or logs can appear too, which is handy for making a few extra gp from farming or Herblore sales.
On the rarer side, brute blacks can drop higher‑value metal/rune items and the occasional mid‑tier rares: think uncommon rune gear, gems or uncut gems, and the odd clue scroll — those clue scrolls can turn a mediocre trip into something nice. There’s also a tiny chance for very rare drops that people get excited about; those are so rare you shouldn’t bank on them, but they’re the reason some folks camp these dragons for long stretches. Overall I go because the bones and hides sell reliably and the chance at a rare makes each kill feel worthwhile.