Teostra isn't my favorite elder dragon but he's pretty damn cool. I find his 4th gen incarnation a lot tougher than his previous fights, mostly due to the blast and with how fast he gets in rage mode. The gimmick of eliminating his chance for the nova attack via mounting is a nice addition. His weapons are all pretty good, though the only one I really use is the SnS. Not a huge fan of the armor skills but it looks pretty cool. I absolutely love his battle theme. Overall I'm glad Teostra returned for 4th gen and he's a very good monster.