im looking at the World map

I still don't understand. Is it after the Forgotten Tomb?

The forgotten tomb is in Region 2. To reach The Lost Grove, you'd need to complete the Tomb, then Aryth's Spire, at which point Region 3 will unlock. Once Region 3 is unlocked, you have to complete everything in the region 3 zones- Sweet Blossom Orchard and Astryl's Tranquility- and revisit the castle in Ethernia (region 3's town) before you gain access to the Grove

The lost grove is the very last part of the map you can unlock. Yes technicly is somwhere after the tomb but you have multiples areas between the two you nead to finish BEFORE you can access it. It is located in Astryl's Vale but you nead to have cleared both the sweet blosom orchard and Astryl tranquility to make it appear on the map.

That's much better. Thank you =)
Now I understand it better.
I didn't know the Sections were known as Regions

Ok so now I'm stuck.
I'm in the Tomb but there's an Inscription thing and next thing i know there's some king guy and I die =(
Help please