Sorry if this info is wrong(only been playing for few weeks), but while playing my own D/D elementalist, which is lvl 25 at the moment. i’ve found Glyph of storms quite helpful while leveling, Earth version that is(Sandstorm, it’s the only one i use anyways). As far as i know it applies blind on targets inside it, which is quite helpful for pulling off Churning earth+ring of earth combo. you can kill bunch of melee mobs this way, but of course this has quite limited use with the cooldown.