The spell forces the "victim" to tell the truth on any questions they are asked, no matter what.
If the user of the spell wishes for the subject to speak the truth to everyone and not just them, the last line can be replaced with "When questions asked whichever."
"Elements reveal truth forever
"When questions asked
"By the four here together"
or
"Elements reveal truth forever
"When questions asked
" When questions asked whichever "