The King Black Dragon uses melee when fighting and also uses four different types of dragon breath attack that have fairly devastating effects, which makes him a well-rounded and difficult foe. His dragon breath attacks are:
- Regular dragonfire
- Shock-like breath that can reduce your stats. It is suggested that you have 70 Defence or higher and good magic defence armour. All stats will be lowered by 1 or 2 points. Super restores could come in handy here but are not required for players with high combat levels or bringing potions such as overloads.
- Ice breath that can stop players from moving or attacking.
- Poison breath that will deal 100 poison damage. You should bring at least 1 anti poison potion if you want to kill him. With the release of Invention, an augmented piece of armour with the Venomblood perk will negate completely the poison damage from this attack.
- There is no way to block the special dragonfire attacks, although the normal Dragonfire can be negated as normal. The breaths can deal various damage, though using an Anti-dragon shield and a dose of Antifire or Super antifire will take the damage from the special breaths down to 100. The attack also has a chance to do its special ability.
You can find the KBD guide here.