Dragon bones, Blue dragonhide
11, 44, 132, 200, 320 or 440 gp
Water runes (75), Nature runes (15), Fire runes (37), Law runes (3)
Steel battleaxe, Mithril hatchet, Mithril spear, Rune dagger, Rune spear, Dragon spear (very rare), Adamant javelin (30), Rune javelin (5), Iron arrows
Steel platelegs (common), Mithril kiteshield, Adamant full helm, Dragon med helm (very rare), Shield left half (very rare)
Gold charm, Crimson charm, Green charm, Blue charm
Grimy herbs (all types), uncut gems, Adamantite ore, Chaos talisman, Nature talisman, Half of a key, Bass, Clue scroll (level 3)
Taverley Dungeon, Heroes' Guild, Watchtower Dungeon
"A mother dragon."
You need an anti-dragon shield to defend against their fire attacks (which can hit up to 61) or they will hit some serious damage on you. The blue dragon's melee attack hits up to 10.