Range:

rune c bow

Red, Black Dhide armour

Ruby E bolts

Ranging potions

Anti dragon shield

Antipoison

telepory runes

The rest should be food

 

Melee:

Good armour

anti dragon shield

Good weapon

Teleport runes

anti poison

Combat potion

rest should be food

 

Tell your group to form a circle around the dragon, this confuses it and makes its attacks slower and less often on one person, after you do that tell the rangers/mages to move back a few steps so they dont get hit with melee damage. after you have formed the circle attack the king black dragon and after you have killed it admire the drops.