Teostra is a fire-breathing wyvern and the toughest of the Elder Dragons. It is advised before you attempt to tackle this monster that your weapon, prefably with a water or ice element is at least rank 5 and that you have strong armour that has a fire resistance of 20 or more. It is also vital you have plenty of cool drinks.
How to beat Teostra
You will need patience to defeat Teostra. Avoid approaching it from the front and aim at the monsters head whenever an opening presents itself as this is its weak spot. Make sure while you are waiting for an opening you stay mobile and at a distance, especially when it is covered in flaming embers as this is when it is at its most dangerous. Watch out for the different attacks the beast can execute from midair and be aware when the monster occasionally rises up into the air it will either slam itself down on the ground delivering an area of effect attack, or breath fire in a line across the battlefield. All you need to focus on doing until the monster is defeated is to keep strafing around the beast whenever it’s in the air and then when it has landed run circle around the creature avoiding its swiping tail and aiming for its head to deal the most damage.
Although during battle you will easily be able to evade most of Teostra's aerial attacks the one that you must be alert for and immedieately flee to safety as quick as you can is when you see any small sparks around the monster. This signals the beast is ready to execute the super nova explosion which can kill you with one hit.