From the second secret puzzle located in Vaha's head, located above the pillar boss room, to get up follow the red path, there is a part that is bugged for some characters to get up but you can either have someone crouch down in front of the broken square or you can jump to the left instead where the blue arrow points https://imgur.com/a/UOIH3Kb
You need to have the 'Atoraxxion - the last tome' from the black spirit to unlock this knowledge

Some kind person also put a 4 part video series for answers