The desert of chaotic thunder is blessed by the 'law' of 'truth' at night, and if you say things that are not true, then you will get struck by the thunder.
The force of this thunder is always equal to what you can handle, and it varies from person to person.
The stronger someone is, the stronger the thunder that falls on them, but the power of this thunder is usually very weak, and it barely just burns you a bit and numbs your body for a few seconds.
It is never lethal and doesn't do much harm.
But things can be changed if another power of the 'Law' interferes in the process.
Jareth had been analyzing the thunder in the sky for a long time with his 'mana singularity'.
After using mana singularity on full capacity for so long, he figured out one thing.
'Mana singularity is likely not a true legendary skill… The power of the 'law' of the world behind it is much weaker… or perhaps it has been degraded…'