Thunder

Everytime the thunder strike upon the human realm, the force become so powerful as if it's come from god - or in Luumist belief, Luum. Luum try to mess with Limm's activity who try to freshen the life down on Earth.
The result is Luum and Limm fighting each other. Even though Limm manage to do her job still, a fraction of Luum's power can be unleashed, and whenever lightning touched, it can cause turn the life into death.
This fight create violent weather: When Limm dominate over Luum, only normal strom occured. When the power swapped, the thunderstrom presents.