I am looking at the area spells that dragons have… Barrage, Blast, Gust, & Tempest.

They all seem to have the range of “self-only”, so I am guessing that none of them are like the bombs that mage has and are meant more for up close combat. They all seem to do Primal damage and none of them repeat... so what am I missing?

With the exception of the damage, what is the difference between these 4 spells? Are they really just Minor Blast, Blast, Improved Blast, & Mega Blast?