How does Scalding Rune work?

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Here is the ability description:
Creates a Fire Rune at target location for 30 seconds, dealing 18 Fire Damage when an enemy enters the area of effect. Affected enemy takes 8 Fire Damage over 10 seconds.

So, if I cast it once, does it always stay on the ground for 30 seconds? Or does it disappear once it has hit one monster? If a monster stands in the rune, does it continue to take both the area of effect damage and the DoT?

Tonturri

You put it on the ground. Once something walked into it, the rune explodes and deals up front damage. A DoT effect is also applied to anything in the AoE that ticks for 10 seconds. The rune disappears after the explosion and will do more damage. The DoT will still tick for its full duration no matter where the enemy is standing.