Teostra are by far one of the most aggressive and dangerous Elder Dragons in the series.
Teostra are shockingly a lot more common than most other Elder Dragons.
Teostra fly less than Lunastra and prefer to fight on land.
Seeing a Teostra breath a fireball or flaming liquid at you isn't common. They prefer to burn their prey with their stream of fire.
Just like Lunastra, his explosive powder is his old skin.
Teostra have been found living in Swamps, Deserts, Volcanos, and even close to some villages or towns. These include Mezeporta, Val Habar, and Dundorma areas.
Teostra have been found to eat coal found in Volcanic areas though its unknown why. Some say its for nutrition while others say to help it fuel its flames. Either way its believed for those reasons or other reasons not yet found.
All Teostra have that explosive mode seen in the 4th Generation. The dust seen in this mode isn't its scales but something else entirely different though what is unknown.
Their explosive powder comes from their wings.
The color/texture of his mane are bit stiff compared to Lunastra's mane.
Like Lunastra, his tail is strong enough to break rock.
His horns symbolize power and majesty. A Supremacy Teostra's horns is said to be a proof of honor.
The coal forms the jewels and gems we get from Teostra, inside its body.
The reason why the Supremacy Teostra's wings are yellow/golden and red-black is because of lava that hardened on them.
Interestingly, Teostra can sometimes be seen drinking lava in MH4U.
MHF2: Lunastra & Teostra Music Theme
MH4: Teostra Introduction by DrTangerine
Monster Hunter 4 - Teostra HAMMER gameplay by iCEMANnoob
I feel I should also mention Teostra's mate. The Empress of Flame herself, Lunastra! It is sad she isn't in MH4U to rule along side her king... At least, we can still trade for her materials...
Monster Hunter Freedom Unite - Empress of Flame (Lunastra_intro) by GSD993
Monster Hunter Freedom Unite - Revived Queen's Battle (Lunastra_intro) by GSD993