Adult Dragon
Adult dragons are a force to be reckoned with. While their younger counter-parts are dangerous for a small region of a country an adult dragon can cripple an economy or wage war from inside it's borders. Their avarice knows no bounds and they are often found keeping large hordes and taking whatever they feel should be theirs. Most countries employ adventurers to drive them off or offer them sacrifices to keep everything stable. They have suprimely powerful elemental magic based on their scales and warp regions around them. Their size is giant and martial figthers are in real trouble against them. They can fly and breath huge quantities of their element. They exert authority over most other monsters and they inspire a terrible fear. They are immune to most conventional weaponary.
Powers: Magic (Region Affecting, Destructive), Size (Varies), Flight, Dragon's Breath, Authority, Fear Aura. Resistance To Weaponary.
Personality: Different colors of dragons embody different emotions but the most common type which is Red embody pride and authority. They often rule countries or regions as careless leaders and if treated right will leave humans mostly alone.
(Warning: It is worth preparing some method of avoiding their breath attacks)
(Tips: Immobilizing their flight is an important first step)