How do I beat a thief as an elementalist?
official counter to thief stealth according to anet is aoe and large stacks of conditions.
Chill is pretty effective against running in general, including running away. AoE works best if preceded by some form of movement impairment.
It’s important to remember that players still take damage while Stealthed. It won’t knock them out of stealth, like in WoW, but they’ll get hit. If you have a decent idea of where they might be standing, you can still pressure them with aoe damage. If you’re good enough you can even hit them with your projectile spells, aiming fps style. Though that’s super difficult.
If you want to completely shut them down (although this take some kitten good reflexes), hitting Earthquake (Earth #4 w/ dagger offhand) and Lightning Flashing onto the location they stealthed will knock them out for the duration of stealth.
At least, I think you can double up those spells. If not, you can always just lead with Lightning Flash.