Nice job
, I'm not really a fan of the DnD elementals, but I really like what you've done with these guys.
My only real problem is with the Air Archon's powers. Archons are like super-elementals right? If so, it seems odd to me that he doesn't have any sort of air powers of his own. I like the powers he has, but they're both support powers of sorts, neither really scream 'I'm a man made of wind!' to me.
Points wise, I'd say 110-120 for Sephyn, 50-60 for the Archon.
Other minor
quibbles-
-'Sephyn the Howling Storm' is called 'Sephyn the Stormcloud' in his ability text.
-In the special attack, there should be a period instead of a coma after 'Range 4' and another period after 'Attack 3'
-Personally, I wouldn't ALL CAPS Swirling Vortex or Blinding Wind Special Attack in the special attack's text, I don't think any official cards do that.