steam_vent.xml

<statusEffects>
  <statusEffect>
    <turns>2</turns>
    <name>Steam Vent</name>
    <key>steam_vent</key>
    <icon>icon_status_steam</icon>
    <reduceOnStartOfTurn>true</reduceOnStartOfTurn>
    <description>
      You are standing near a steam vent and will take damage at the start of every turn.
      [p]Damage increases the closer you are to the source.
    </description>
  </statusEffect>
</statusEffects>